diff --git a/content/case.md b/content/case.md
index e582bde..9e42313 100644
--- a/content/case.md
+++ b/content/case.md
@@ -30,7 +30,7 @@ else:
   echo "Consonant"
 
 proc positiveOrNegative(num: int): string =
-  result = case num
+  result = case num:
     of low(int)..-1:
       "negative"
     of 0: