diff --git a/compose/compose-file/index.md b/compose/compose-file/index.md
index 6f4ac4779b..f332495f6c 100644
--- a/compose/compose-file/index.md
+++ b/compose/compose-file/index.md
@@ -1380,6 +1380,8 @@ containers in the bare-metal machine's namespace and vise-versa.
 
 Expose ports.
 
+> **Note:** Port mapping is incompatible with `network_mode: host`
+
 #### Short syntax
 
 Either specify both ports (`HOST:CONTAINER`), or just the container