diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index 22ecbb551d8973..c77c1b3ba99a01 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -35,7 +35,7 @@ on efficient attribute extraction for output formatting and manipulation.
 Aware and Naive Objects
 -----------------------
 
-Date and time objects may be categorized as "aware" or "naive."
+Date and time objects may be categorized as "aware" or "naive".
 
 With sufficient knowledge of applicable algorithmic and political time
 adjustments, such as time zone and daylight saving time information,