diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index cf3e8a684dfab..9985cc2b27ad1 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -332,7 +332,7 @@ impl fmt::Display for Utf8Error {
 Section: Iterators
 */
 
-/// Iterator for the char (representing *Unicode Scalar Values*) of a string
+/// Iterator for the char (representing *Unicode Scalar Values*) of a string.
 ///
 /// Created with the method [`chars`].
 ///