diff --git a/docs/running.md b/docs/running.md
index 230e3021..c10306c9 100644
--- a/docs/running.md
+++ b/docs/running.md
@@ -31,7 +31,11 @@ In this case, cAdvisor UI should be accessible on `http://192.168.59.103:8080`
 
 ### CentOS and RHEL
 
-On CentOS and RHEL the cgroup hierarchies are mounted in `/cgroup` so run cAdvisor with an additional Docker option of `--volume=/cgroup:/cgroup \`.
+You may need to run the container with `--privilege` and `--volume=/cgroup:/cgroup \` in order for cAdvisor to monitor Docker containers.
+
+RHEL and CentOS lock down their containers a bit more. cAdvisor needs access to the Docker daemon through its socket. This requires `--privilege` in RHEL and CentOS.
+
+On some versions of RHEL and CentOS the cgroup hierarchies are mounted in `/cgroup` so run cAdvisor with an additional Docker option of `--volume=/cgroup:/cgroup \`.
 
 ## Debian