diff --git a/README.md b/README.md
index 295b98b..0c970d5 100644
--- a/README.md
+++ b/README.md
@@ -335,7 +335,7 @@ Check out the following links to get a better idea of what to expect:
 | Design a hash map | [Solution](https://github.com/donnemartin/system-design-primer/blob/master/solutions/object_oriented_design/hash_table/hash_map.ipynb)  |
 | Design a least recently used cache | [Solution](https://github.com/donnemartin/system-design-primer/blob/master/solutions/object_oriented_design/lru_cache/lru_cache.ipynb)  |
 | Design a parking lot | [Solution](https://github.com/donnemartin/system-design-primer/blob/master/solutions/object_oriented_design/parking_lot/parking_lot.ipynb)  |
-| Design a chat server | [Solution](https://github.com/donnemartin/system-design-primer/blob/master/solutions/object_oriented_design/chat_server/chat_server.ipynb)  |
+| Design a chat server | [Solution](https://github.com/donnemartin/system-design-primer/blob/master/solutions/object_oriented_design/online_chat/online_chat.ipynb)  |
 | Design a circular array | [Contribute](#contributing)  |
 | Add an object-oriented design question | [Contribute](#contributing) |