diff --git a/documentation/README.md b/documentation/README.md
index 6723d70..0fe4ac7 100644
--- a/documentation/README.md
+++ b/documentation/README.md
@@ -6,6 +6,8 @@ Clone the project (for example, in `C:/Web`):
 
 ```git clone https://github.com/leongersen/noUiSlider nouislider```
 
+Note that the documentation assumes a clone in a lowercase "nouislider" directory.
+
 You can now run the following shorthand to start the server:
 
 ```
@@ -14,6 +16,12 @@ npm run docs
 
 You can now access the documentation at `http://localhost:8080/nouislider/`.
 
+To run on another port, set a `PORT` environment variable:
+
+```
+PORT=8086 npm run docs
+```
+
 Alternatively, in your root (e.g. `C:/Web`), start the server:
 
 ```php -S localhost:8080 nouislider/documentation/_run/router.php```
diff --git a/package.json b/package.json
index de200d1..349f076 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "prepublishOnly": "npm run build",
     "format": "prettier src/nouislider.ts --write --config .prettierrc",
     "lint": "eslint src/nouislider.ts",
-    "docs": "cd ../ && php -S localhost:8080 nouislider/documentation/_run/router.php"
+    "docs": "cd ../ && php -S localhost:${PORT:-8080} nouislider/documentation/_run/router.php"
   },
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^5.10",