diff --git a/.changeset/heavy-tomatoes-sing.md b/.changeset/heavy-tomatoes-sing.md
new file mode 100644
index 0000000..bf5a7c5
--- /dev/null
+++ b/.changeset/heavy-tomatoes-sing.md
@@ -0,0 +1,5 @@
+---
+"rehype-jsoncanvas": patch
+---
+
+Added filetype checking and updated readme
diff --git a/package.json b/package.json
index 092a1f3..bd56df8 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,7 @@
     "gen:docs": "rm -rf ./docs/api && typedoc --options typedoc.cjs",
     "prepublishOnly": "npm run build",
     "prepare": "lefthook install",
+    "change": "changeset",
     "release": "npm run prepublishOnly && changeset publish",
     "devpub": "yalc push --scripts --update --replace"
   },