diff --git a/doc/source/docker.rst b/doc/source/docker.rst
index ae67b325..02c3acdd 100644
--- a/doc/source/docker.rst
+++ b/doc/source/docker.rst
@@ -119,6 +119,10 @@ You can run the test suite with
 
     docker exec chatmail /opt/cmdeploy/bin/cmdeploy test --ssh-host localhost
 
+You can look at logs
+
+    docker exec chatmail journalctl -fu postfix@-
+
 
 Customization
 -------------