diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..684fbd9
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,10 @@
+declare function rangeMap(
+  input: number,
+  inLow: number,
+  inHigh: number,
+  outLow: number,
+  outHigh: number,
+  clampValue?: boolean
+): number;
+
+export = rangeMap;
diff --git a/package.json b/package.json
index 674182d..c3ede29 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
   "name": "range-map",
-  "version": "1.0.2",
+  "version": "1.1.0",
   "description": "",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "test": "jest && codecov"
   },