diff --git a/README.md b/README.md
index 5f26148..992366e 100644
--- a/README.md
+++ b/README.md
@@ -104,7 +104,7 @@ Set
 ```
 
 ### Frozenset
-#### Is hashable and can be used as a key in dictionary:
+#### Is hashable and can be used as a key in dictionary.
 ```python
 <frozenset> = frozenset(<collection>)
 ```