diff --git a/README.md b/README.md
index 773e435..e6a749b 100644
--- a/README.md
+++ b/README.md
@@ -66,4 +66,7 @@ This setup ensures better security by:
 - Running Mailcow with minimal required permissions
 - Keeping Docker operations separate from root
 - Maintaining proper file ownership
-- Allowing for easier maintenance and updates
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+- Allowing for easier maintenance and updates
+
+###How to bind IPv4 and IPv6 together?
+https://github.com/mailcow/mailcow-dockerized/issues/1978#issuecomment-474780861
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