diff --git a/docs/content/config/troubleshooting/faq.md b/docs/content/config/troubleshooting/faq.md
index 3f58e58d..267c5682 100644
--- a/docs/content/config/troubleshooting/faq.md
+++ b/docs/content/config/troubleshooting/faq.md
@@ -65,4 +65,8 @@ If everything is OK regarding DNS, please provide [formatted logs](https://guide
 If we're blind, we won't be able to do anything.
 
 ### Which system requirements needs my container to run `docker-mailserver` effectively?
-1 core and 1GB of RAM is recommended, even it could work with 512M of RAM.
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+1 core and 1GB of RAM is recommended, even it could work with 512M of RAM.
+
+### Is `docker-mailserver` running in a [rancher environment](http://rancher.com/rancher/)?
+
+Yes, but use the option `PERMIT_DOCKER: network`.
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