Add note about --entrypoint overriding default command
@@ -1305,6 +1305,9 @@ or two examples of how to pass more parameters to that ENTRYPOINT:
$ docker run -it --entrypoint /bin/bash example/redis -c ls -l
$ docker run -it --entrypoint /usr/bin/redis-cli example/redis --help
+> **Note**: Passing `--entrypoint` will clear out any default command set on the
+> image (i.e. any `CMD` instruction in the Dockerfile used to build it).
+
### EXPOSE (incoming ports)
The following `run` command options work with container networking:
