diff --git a/linter/spectral.yml b/linter/spectral.yml
index da7089a..407143c 100644
--- a/linter/spectral.yml
+++ b/linter/spectral.yml
@@ -172,8 +172,8 @@ rules:
           char: ""
 
   nlgov:servers-use-https:
-    severity: warn
-    message: "Server URL {{value}} {{error}}."
+    severity: error
+    message: "Server URL {{value}} must start with https:// instead of http://."
     given:
       - $.servers[*]
       - $.paths..servers[*]
@@ -181,7 +181,46 @@ rules:
       field: url
       function: pattern
       functionOptions:
-        match: ^https://.*
+        notMatch: ^http://.*
+
+  nlgov:servers-at-most-one-relative:
+    severity: error
+    message: "At most one relative URL may be specified as server."
+    given:
+      - $.servers
+      - $.paths..servers
+    then:
+      function: schema
+      functionOptions:
+        dialect: draft2020-12
+        schema:
+          type: array
+          contains:
+            type: object
+            properties:
+              url:
+                pattern: ^(?!https:).+
+          minContains: 0
+          maxContains: 1
+
+  nlgov:servers-at-least-one-absolute:
+    severity: error
+    message: "At least one absolute URL must be specified as server."
+    given:
+      - $.servers
+      - $.paths..servers
+    then:
+      function: schema
+      functionOptions:
+        dialect: draft2020-12
+        schema:
+          type: array
+          contains:
+            type: object
+            properties:
+              url:
+                pattern: ^https://.*
+          minContains: 1
 
   nlgov:use-problem-schema:
     severity: warn
diff --git a/linter/testcases/servers-empty/expected-output.txt b/linter/testcases/servers-empty/expected-output.txt
index 866834c..d50a6d3 100644
--- a/linter/testcases/servers-empty/expected-output.txt
+++ b/linter/testcases/servers-empty/expected-output.txt
@@ -1,5 +1,6 @@
 
 /testcases/servers-empty/openapi.json
- 13:15  error  oas3-api-servers  OpenAPI "servers" must be present and non-empty array.  servers
+ 13:15  error  nlgov:servers-at-least-one-absolute  At least one absolute URL must be specified as server.  servers
+ 13:15  error  oas3-api-servers                     OpenAPI "servers" must be present and non-empty array.  servers
 
-✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)
+✖ 2 problems (2 errors, 0 warnings, 0 infos, 0 hints)
diff --git a/linter/testcases/servers-no-absolute/expected-output.txt b/linter/testcases/servers-no-absolute/expected-output.txt
new file mode 100644
index 0000000..6e2a080
--- /dev/null
+++ b/linter/testcases/servers-no-absolute/expected-output.txt
@@ -0,0 +1,5 @@
+
+/testcases/servers-no-absolute/openapi.json
+ 13:15  error  nlgov:servers-at-least-one-absolute  At least one absolute URL must be specified as server.  servers
+
+✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)
diff --git a/linter/testcases/servers-no-absolute/openapi.json b/linter/testcases/servers-no-absolute/openapi.json
new file mode 100644
index 0000000..11938a9
--- /dev/null
+++ b/linter/testcases/servers-no-absolute/openapi.json
@@ -0,0 +1,81 @@
+{
+    "openapi": "3.0.3",
+    "info": {
+        "title": "Baseline",
+        "description": "Deze OpenAPI specification bevat het minimale om aan alle regels te voldoen.",
+        "contact": {
+            "name": "Beheerder",
+            "url": "https://www.example.com",
+            "email": "mail@example.com"
+        },
+        "version": "1.0.0"
+    },
+    "servers": [
+        {
+            "url": "/api/v1",
+            "description": "API location on the origin that the openapi.json is served"
+        }
+    ],
+    "security": [
+        {
+            "default": []
+        }
+    ],
+    "tags": [
+        {
+            "name": "openapi"
+        }
+    ],
+    "paths": {
+        "/openapi.json": {
+            "get": {
+                "tags": [
+                    "openapi"
+                ],
+                "description": "OpenAPI document",
+                "operationId": "getOpenapiJSON",
+                "parameters": [],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "headers": {
+                            "API-Version": {
+                                "description": "De huidige versie van de applicatie",
+                                "style": "simple",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            },
+                            "access-control-allow-origin": {
+                                "description": "Alle origins mogen bij deze resource",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "default": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+        },
+        "securitySchemes": {
+            "default": {
+                "type": "oauth2",
+                "flows": {
+                    "implicit": {
+                        "authorizationUrl": "https://test.com",
+                        "scopes": {}
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/linter/testcases/servers-no-https/expected-output.txt b/linter/testcases/servers-no-https/expected-output.txt
new file mode 100644
index 0000000..6070a9a
--- /dev/null
+++ b/linter/testcases/servers-no-https/expected-output.txt
@@ -0,0 +1,5 @@
+
+/testcases/servers-no-https/openapi.json
+ 15:20  error  nlgov:servers-use-https  Server URL http://production.example.com/api/v1 must start with https:// instead of http://.  servers[0].url
+
+✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)
diff --git a/linter/testcases/servers-no-https/openapi.json b/linter/testcases/servers-no-https/openapi.json
new file mode 100644
index 0000000..f9ea2e5
--- /dev/null
+++ b/linter/testcases/servers-no-https/openapi.json
@@ -0,0 +1,85 @@
+{
+    "openapi": "3.0.3",
+    "info": {
+        "title": "Baseline",
+        "description": "Deze OpenAPI specification bevat het minimale om aan alle regels te voldoen.",
+        "contact": {
+            "name": "Beheerder",
+            "url": "https://www.example.com",
+            "email": "mail@example.com"
+        },
+        "version": "1.0.0"
+    },
+    "servers": [
+        {
+            "url": "http://production.example.com/api/v1",
+            "description": "Production server"
+        },
+        {
+            "url": "https://staging.example.com/api/v1",
+            "description": "Pre-production server"
+        }
+    ],
+    "security": [
+        {
+            "default": []
+        }
+    ],
+    "tags": [
+        {
+            "name": "openapi"
+        }
+    ],
+    "paths": {
+        "/openapi.json": {
+            "get": {
+                "tags": [
+                    "openapi"
+                ],
+                "description": "OpenAPI document",
+                "operationId": "getOpenapiJSON",
+                "parameters": [],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "headers": {
+                            "API-Version": {
+                                "description": "De huidige versie van de applicatie",
+                                "style": "simple",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            },
+                            "access-control-allow-origin": {
+                                "description": "Alle origins mogen bij deze resource",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "default": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+        },
+        "securitySchemes": {
+            "default": {
+                "type": "oauth2",
+                "flows": {
+                    "implicit": {
+                        "authorizationUrl": "https://test.com",
+                        "scopes": {}
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/linter/testcases/servers-relative-one/expected-output.txt b/linter/testcases/servers-relative-one/expected-output.txt
new file mode 100644
index 0000000..95cc954
--- /dev/null
+++ b/linter/testcases/servers-relative-one/expected-output.txt
@@ -0,0 +1 @@
+No results with a severity of 'error' found!
diff --git a/linter/testcases/servers-relative-one/openapi.json b/linter/testcases/servers-relative-one/openapi.json
new file mode 100644
index 0000000..4a42d58
--- /dev/null
+++ b/linter/testcases/servers-relative-one/openapi.json
@@ -0,0 +1,89 @@
+{
+    "openapi": "3.0.3",
+    "info": {
+        "title": "Baseline",
+        "description": "Deze OpenAPI specification bevat het minimale om aan alle regels te voldoen.",
+        "contact": {
+            "name": "Beheerder",
+            "url": "https://www.example.com",
+            "email": "mail@example.com"
+        },
+        "version": "1.0.0"
+    },
+    "servers": [
+        {
+            "url": "https://production.example.com/api/v1",
+            "description": "Production server"
+        },
+        {
+            "url": "https://staging.example.com/api/v1",
+            "description": "Pre-production server"
+        },
+        {
+            "url": "/api/v1",
+            "description": "API location on the origin that the openapi.json is served"
+        }
+    ],
+    "security": [
+        {
+            "default": []
+        }
+    ],
+    "tags": [
+        {
+            "name": "openapi"
+        }
+    ],
+    "paths": {
+        "/openapi.json": {
+            "get": {
+                "tags": [
+                    "openapi"
+                ],
+                "description": "OpenAPI document",
+                "operationId": "getOpenapiJSON",
+                "parameters": [],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "headers": {
+                            "API-Version": {
+                                "description": "De huidige versie van de applicatie",
+                                "style": "simple",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            },
+                            "access-control-allow-origin": {
+                                "description": "Alle origins mogen bij deze resource",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "default": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+        },
+        "securitySchemes": {
+            "default": {
+                "type": "oauth2",
+                "flows": {
+                    "implicit": {
+                        "authorizationUrl": "https://test.com",
+                        "scopes": {}
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/linter/testcases/servers-relative-two/expected-output.txt b/linter/testcases/servers-relative-two/expected-output.txt
new file mode 100644
index 0000000..3e5525f
--- /dev/null
+++ b/linter/testcases/servers-relative-two/expected-output.txt
@@ -0,0 +1,5 @@
+
+/testcases/servers-relative-two/openapi.json
+ 13:15  error  nlgov:servers-at-most-one-relative  At most one relative URL may be specified as server.  servers
+
+✖ 1 problem (1 error, 0 warnings, 0 infos, 0 hints)
diff --git a/linter/testcases/servers-relative-two/openapi.json b/linter/testcases/servers-relative-two/openapi.json
new file mode 100644
index 0000000..f6fe366
--- /dev/null
+++ b/linter/testcases/servers-relative-two/openapi.json
@@ -0,0 +1,93 @@
+{
+    "openapi": "3.0.3",
+    "info": {
+        "title": "Baseline",
+        "description": "Deze OpenAPI specification bevat het minimale om aan alle regels te voldoen.",
+        "contact": {
+            "name": "Beheerder",
+            "url": "https://www.example.com",
+            "email": "mail@example.com"
+        },
+        "version": "1.0.0"
+    },
+    "servers": [
+        {
+            "url": "https://production.example.com/api/v1",
+            "description": "Production server"
+        },
+        {
+            "url": "https://staging.example.com/api/v1",
+            "description": "Pre-production server"
+        },
+        {
+            "url": "/api/v1",
+            "description": "API location on the origin that the openapi.json is served"
+        },
+        {
+            "url": "/api/v2",
+            "description": "API location on the origin that the openapi.json is served"
+        }
+    ],
+    "security": [
+        {
+            "default": []
+        }
+    ],
+    "tags": [
+        {
+            "name": "openapi"
+        }
+    ],
+    "paths": {
+        "/openapi.json": {
+            "get": {
+                "tags": [
+                    "openapi"
+                ],
+                "description": "OpenAPI document",
+                "operationId": "getOpenapiJSON",
+                "parameters": [],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "headers": {
+                            "API-Version": {
+                                "description": "De huidige versie van de applicatie",
+                                "style": "simple",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            },
+                            "access-control-allow-origin": {
+                                "description": "Alle origins mogen bij deze resource",
+                                "schema": {
+                                    "type": "string"
+                                }
+                            }
+                        }
+                    }
+                },
+                "security": [
+                    {
+                        "default": []
+                    }
+                ]
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+        },
+        "securitySchemes": {
+            "default": {
+                "type": "oauth2",
+                "flows": {
+                    "implicit": {
+                        "authorizationUrl": "https://test.com",
+                        "scopes": {}
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/sections/designRules.md b/sections/designRules.md
index 60c76cb..f1b81f5 100644
--- a/sections/designRules.md
+++ b/sections/designRules.md
@@ -534,6 +534,47 @@ An API is as good as the accompanying documentation. The documentation has to be
    </dl>
 </div>
 
+<div class="rule" id="/core/doc-openapi-servers" data-type="technical">
+  <p class="rulelab">Document server information</p>
+  <dl>
+      <dt>Statement</dt>
+      <dd>
+         OpenAPI definition document MUST include at least one Server object in <a href="https://spec.openapis.org/oas/v3.0.1.html#server-object"><code>servers</code></a>.
+         One or more Server objects MUST have a <code>url</code> which is an absolute URL.
+         At most one Server object MAY have a <url>url</code> which is a relative URL.
+      </dd>
+      <dt>Rationale</dt>
+      <dd>
+         The OpenAPI Specification (OAS) [[OPENAPIS]] can include information about servers which serve this API. It can list different environments, such as production and pre-production. If desired, a relative URL can be used to denote where an API resides, regardless of origin. However, only one relative URL may be present to avoid ambiguation for consumers which relative URL is applicable for the current origin.
+         <aside class="example">
+            <pre><code class="json">{
+  "servers": [
+    {
+      "url": "https://production.example.com/api/v1",
+      "description": "Production server"
+    },
+    {
+      "url": "https://staging.example.com/api/v1",
+      "description": "Pre-production server"
+    },
+    {
+      "url": "/api/v1",
+      "description": "API location on the origin that the openapi.json is served"
+    }
+  ]
+}</code></pre>
+         </aside>
+      </dd>
+      <dt>How to test</dt>
+      <dd>
+        <ul>
+          <li>Step 1: Parse the OpenAPI Description to confirm the <code>servers</code> list is present.</li>
+          <li>Step 2: The list contains at least one object with an absolute URL</li>
+          <li>Step 3: The list contains at most one object with a relative URL</li>
+      </dd>
+   </dl>
+</div>
+
 <span id="api-17"></span>
 <div class="rule" id="/core/doc-language" data-type="functional">
   <p class="rulelab">Publish documentation in Dutch unless there is existing documentation in English</p>