diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..42d955b
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,7 @@
+/**
+Check if a string is HTML.
+
+@param string - The string to check if it is HTML.
+@returns `true` if the string is HTML, `false` otherwise.
+*/
+export default function isHtml(string: string): boolean;
diff --git a/package.json b/package.json
index 8b68f4e..e11a68f 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
 	},
 	"type": "module",
 	"exports": "./index.js",
+	"types": "./index.d.ts",
 	"engines": {
 		"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
 	},
@@ -19,7 +20,8 @@
 		"test": "xo && ava"
 	},
 	"files": [
-		"index.js"
+		"index.js",
+		"index.d.ts"
 	],
 	"keywords": [
 		"html",