diff --git a/.github/script/STEP b/.github/script/STEP
index d00491f..b8626c4 100644
--- a/.github/script/STEP
+++ b/.github/script/STEP
@@ -1 +1 @@
-1
+4
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..5568aaa
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,32 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run markdown lint
+        run: |
+          npm install remark-cli remark-preset-lint-consistent
+          npx remark . --use remark-preset-lint-consistent --frail
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: remark-lint-report
+          path: public/
diff --git a/README.md b/README.md
index b9639ca..aad8c03 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ endstep0-->
   Encourage users to open new tabs for steps!
 -->
 
-<details id=1 open>
+<details id=1>
 <summary><h2>Step 1: Add a test workflow</h2></summary>
 
 _Welcome to "GitHub Actions: Continuous Integration"! :wave:_
@@ -112,7 +112,7 @@ When the tests finish, you'll see a red X :x: or a green check mark :heavy_check
 
 <!-- Note here: Learners -- yup, you found the error! Course maintainers -- leave the italics with * instead of _ for the error case. -->
 
-*By looking at the logs, can you identify which tests failed?* To find it, go to one of the failed builds and scrolling through the log. Look for a section that lists all the unit tests. We're looking for the name of the test with an "x".
+_By looking at the logs, can you identify which tests failed?_ To find it, go to one of the failed builds and scrolling through the log. Look for a section that lists all the unit tests. We're looking for the name of the test with an "x".
 
 <img alt="screenshot of a sample build log with the names of the tests blurred out" src=https://user-images.githubusercontent.com/16547949/65922013-e740a200-e3b1-11e9-8151-faf52c30201e.png width=400 />
 
@@ -181,7 +181,7 @@ Similar to the upload action to send artifacts to the storage, you can use anoth
   Define terms and link to docs.github.com.
 -->
 
-<details id=4>
+<details id=4 open>
 <summary><h2>Step 4: Add branch protections</h2></summary>
 
 _Great job uploading test reports! :partying_face:_