diff --git a/index.js b/index.js
index 983daca..c8d8831 100644
--- a/index.js
+++ b/index.js
@@ -1,8 +1,12 @@
-export default function copyTextToClipboard(input, {target = document.body} = {}) {
+export default function copyTextToClipboard(text, {target = document.body} = {}) {
+	if (typeof text !== 'string') {
+		throw new TypeError(`Expected parameter \`text\` to be a \`string\`, got \`${typeof text}\`.`);
+	}
+
 	const element = document.createElement('textarea');
 	const previouslyFocusedElement = document.activeElement;
 
-	element.value = input;
+	element.value = text;
 
 	// Prevent keyboard from showing on mobile
 	element.setAttribute('readonly', '');
@@ -20,7 +24,7 @@ export default function copyTextToClipboard(input, {target = document.body} = {}
 
 	// Explicit selection workaround for iOS
 	element.selectionStart = 0;
-	element.selectionEnd = input.length;
+	element.selectionEnd = text.length;
 
 	let isSuccess = false;
 	try {
diff --git a/package.json b/package.json
index e8f30b5..2178167 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,8 @@
 		"node": ">=12"
 	},
 	"scripts": {
-		"test": "xo && tsd"
+		"//test": "xo && tsd",
+		"test": "xo"
 	},
 	"files": [
 		"index.js",
diff --git a/readme.md b/readme.md
index d081a52..92c6056 100644
--- a/readme.md
+++ b/readme.md
@@ -11,8 +11,8 @@
 
 ## Install
 
-```
-$ npm install copy-text-to-clipboard
+```sh
+npm install copy-text-to-clipboard
 ```
 
 ## Usage