diff --git a/training-slides/src/shared-mutability.md b/training-slides/src/shared-mutability.md
index 42d1908..b9483c3 100644
--- a/training-slides/src/shared-mutability.md
+++ b/training-slides/src/shared-mutability.md
@@ -278,7 +278,7 @@ To get *shared ownership* and *mutability* you need two things:
 
 ## `OnceCell` for special cases
 
-If you only need to modify a field *once*, a `OnceCell` can help you keep the ownership system checks at compile-time.
+If you only need to modify a field *once*, a `OnceCell` can help you keep the ownership system checks at compile-time
 
 ```rust
 use std::time::Instant;