diff --git a/snippets/difference.md b/snippets/difference.md
index 0ae57c7c4..21d09c5c1 100644
--- a/snippets/difference.md
+++ b/snippets/difference.md
@@ -2,7 +2,7 @@
 
 Returns the difference between two iterables.
 
-Use list comprehension to only keep values not contained in `b`. Use set to test `in` in `O(1)` time.
+Use list comprehension to only keep values not contained in `b`.
 
 ```python
 def difference(a, b):