diff --git a/exercises/concept/troll-the-trolls/.docs/introduction.md b/exercises/concept/troll-the-trolls/.docs/introduction.md
index 7ec79a102..07718a20a 100644
--- a/exercises/concept/troll-the-trolls/.docs/introduction.md
+++ b/exercises/concept/troll-the-trolls/.docs/introduction.md
@@ -143,7 +143,7 @@ case 3:
 default:
     book_house(group_size);
 }
-// book_apartment happens wheng roup_size is 2 or 3
+// book_apartment happens when group_size is 2 or 3
 ```
 
-[magic numbers]: https://en.wikipedia.org/wiki/Magic_number_(programming)
\ No newline at end of file
+[magic numbers]: https://en.wikipedia.org/wiki/Magic_number_(programming)