diff --git a/extensions/markedit-readable-width.json b/extensions/markedit-readable-width.json
new file mode 100644
index 0000000..41ba126
--- /dev/null
+++ b/extensions/markedit-readable-width.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "https://github.com/MarkEdit-app/extensions/raw/refs/heads/main/schemas/extension.schema.json",
+  "id": "markedit-readable-width",
+  "name": "Readable Width",
+  "description": "Keeps the editor at a readable maximum width and centers it when the window is wider.",
+  "author": "MarkEdit-app",
+  "homepage": "https://github.com/MarkEdit-app/MarkEdit-readable-width",
+  "versions": [
+    {
+      "version": "1.0.0",
+      "url": "https://github.com/MarkEdit-app/MarkEdit-readable-width/releases/download/v1.0.0/markedit-readable-width.js",
+      "sha256": "c294ae3dd4de07e636f98d5dc4a6c943b8a5c99165afe102fd551361a67cae4f"
+    }
+  ]
+}