diff --git a/guide/english/algorithms/algorithm-design-patterns/behavioral-patterns/index.md b/guide/english/algorithms/algorithm-design-patterns/behavioral-patterns/index.md
index 18975f932e..2ba8f5566f 100644
--- a/guide/english/algorithms/algorithm-design-patterns/behavioral-patterns/index.md
+++ b/guide/english/algorithms/algorithm-design-patterns/behavioral-patterns/index.md
@@ -15,7 +15,7 @@ Examples of this type of design pattern include:
 5. **Mediator pattern**: Provides a unified interface to a set of interfaces in a subsystem.
 6. **Memento pattern**: Provides the ability to restore an object to its previous state (rollback).
 7. **Null Object pattern**: Designed to act as a default value of an object.
-8. **Observer pattern**: a.k.a. P**ublish/Subscribe** or **Event Listener**. Objects register to observe an event that may be raised by another object.
+8. **Observer pattern**: a.k.a. **Publish/Subscribe** or **Event Listener**. Objects register to observe an event that may be raised by another object.
 9. **Weak reference pattern**: De-couple an observer from an observable event.
 10. **Protocol stack**: Communications are handled by multiple layers, which form an encapsulation hierarchy.
 11. **Scheduled-task pattern**: A task is scheduled to be performed at a particular interval or clock time (used in real-time computing).