diff --git a/README.md b/README.md
index 640d273..aa817a1 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ and divided into three groups.
 - [Iterator](behavioral/iterator/README.md)
 - [Mediator](behavioral/mediator/README.md)
 - [Memento](behavioral/memento/README.md)
+- [Observer](behavioral/observer/README.md)
 
 ## Resources
 
diff --git a/behavioral/README.md b/behavioral/README.md
index 10b3715..99b8de5 100644
--- a/behavioral/README.md
+++ b/behavioral/README.md
@@ -9,3 +9,4 @@ Behavioral design patterns are concerned with algorithms and the assignment of r
 - [Iterator](iterator/README.md)
 - [Mediator](mediator/README.md)
 - [Memento](memento/README.md)
+- [Observer](observer/README.md)
diff --git a/behavioral/observer/README.md b/behavioral/observer/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/behavioral/observer/__init__.py b/behavioral/observer/__init__.py
new file mode 100644
index 0000000..ee00f9e
--- /dev/null
+++ b/behavioral/observer/__init__.py
@@ -0,0 +1,4 @@
+"""
+Lets you define a subscription mechanism to notify multiple objects about any
+events that happen to the object they’re observing.
+"""