diff --git a/docs/reverse.rst b/docs/reverse.rst
index 8d0dcc8e..91c6f67e 100644
--- a/docs/reverse.rst
+++ b/docs/reverse.rst
@@ -189,7 +189,7 @@ Mailu must also be configured with the information what header is used by the re
 .. code-block:: docker
   
   #mailu.env file
-  REAL_IP_HEADER=X-Real-IP
+  REAL_IP_HEADER=X-Real-Ip
   REAL_IP_FROM=x.x.x.x,y.y.y.y.y
   #x.x.x.x,y.y.y.y.y is the static IP address your reverse proxy uses for connecting to Mailu.