diff --git a/knowledge base/docker.md b/knowledge base/docker.md
index f612f47..2caf101 100644
--- a/knowledge base/docker.md	
+++ b/knowledge base/docker.md	
@@ -406,6 +406,7 @@ docker load …
 - [Docker Buildx Bake + Gitlab CI Matrix]
 - [How to list the content of a named volume in docker 1.9+?]
 - [Difference between Expose and Ports in Docker Compose]
+- [Unable to reach services behind VPN from docker container]
 
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   Reference
@@ -434,3 +435,4 @@ docker load …
 [getting around docker's host network limitation on mac]: https://medium.com/@lailadahi/getting-around-dockers-host-network-limitation-on-mac-9e4e6bfee44b
 [how to list the content of a named volume in docker 1.9+?]: https://stackoverflow.com/questions/34803466/how-to-list-the-content-of-a-named-volume-in-docker-1-9
 [opencontainers image spec]: https://specs.opencontainers.org/image-spec/
+[unable to reach services behind vpn from docker container]: https://github.com/docker/for-mac/issues/5322