diff --git a/README.md b/README.md
index 9f36f41..1e6ac36 100644
--- a/README.md
+++ b/README.md
@@ -651,7 +651,7 @@ If you are interfacing with Docker via TCP, set `DOCKER_HOST` to the correct URL
 DOCKER_HOST=tcp://docker_socket_proxy:2375
 ```
 
-In case you are using a socket proxy, it must support `GET` and `POST` requests to the `/containers` endpoint. If you are using Docker Swarm, it must also support the `/services` endpoint.
+In case you are using a socket proxy, it must support `GET` and `POST` requests to the `/containers` endpoint. If you are using Docker Swarm, it must also support the `/services` endpoint. If you are using pre/post backup commands, it must also support the `/exec` endpoint.
 
 ## Recipes