diff --git a/_overviews/scala-book/collections-maps.md b/_overviews/scala-book/collections-maps.md
index 22c0a3100e..1556a66ef8 100644
--- a/_overviews/scala-book/collections-maps.md
+++ b/_overviews/scala-book/collections-maps.md
@@ -46,7 +46,7 @@ keys: Iterable[Int] = Set(1, 2, 3, 4)
 scala> val values = m.values
 val values: Iterable[String] = MapLike.DefaultValuesIterable(a, b, c, d)
 
-// how to test if a Map contains a value
+// how to test if a Map contains a key
 scala> val contains3 = m.contains(3)
 contains3: Boolean = true