diff --git a/README.md b/README.md
index dddd5b9e3..adb6cf6db 100644
--- a/README.md
+++ b/README.md
@@ -637,10 +637,10 @@ const tail = arr => arr.length > 1 ? arr.slice(1) : arr;
 
 ### Truncate a String
 
-Determine if the string's `length` is greater than `num`. 
+Determine if the string's `length` is greater than `num`.
 Return the string truncated to the desired length, with `...` appended to the end or the original string.
 
-```
+```js
 const truncate = (str, num) =>
   str.length > num ? str.slice(0, num > 3 ? num-3 : num) + '...' : str;
 // truncate('boomerang', 7) -> 'boom...'
diff --git a/snippets/truncate-a-string.md b/snippets/truncate-a-string.md
index 5c2a091cb..556667781 100644
--- a/snippets/truncate-a-string.md
+++ b/snippets/truncate-a-string.md
@@ -1,9 +1,9 @@
 ### Truncate a String
 
-Determine if the string's `length` is greater than `num`. 
+Determine if the string's `length` is greater than `num`.
 Return the string truncated to the desired length, with `...` appended to the end or the original string.
 
-```
+```js
 const truncate = (str, num) =>
   str.length > num ? str.slice(0, num > 3 ? num-3 : num) + '...' : str;
 // truncate('boomerang', 7) -> 'boom...'