diff --git a/src/doc/tutorial.md b/src/doc/tutorial.md
index b0ce038cf5722..e4480e26cccd7 100644
--- a/src/doc/tutorial.md
+++ b/src/doc/tutorial.md
@@ -2196,7 +2196,7 @@ and may not be overridden:
 Types are sendable
 unless they contain references.
 
-* `Share` - Types that are *threadsafe*
+* `Share` - Types that are *threadsafe*.
 These are types that are safe to be used across several threads with access to
 a `&T` pointer. `Mutex<T>` is an example of a *sharable* type with internal mutable data.