diff --git a/README.md b/README.md
index 8641563effa..c9ca6c933d5 100644
--- a/README.md
+++ b/README.md
@@ -389,6 +389,11 @@ Support this project with a :star:
     # Default: "true"
     escape_json: ''
 
+    # Exclude changes to submodules.
+    # Type: boolean
+    # Default: "false"
+    exclude_submodules: ''
+
     # Fail when the initial diff fails.
     # Type: boolean
     # Default: "false"