diff --git a/gen-key-constants.py b/gen-key-constants.py
index 8ad5dbff0..4701f25e5 100644
--- a/gen-key-constants.py
+++ b/gen-key-constants.py
@@ -116,7 +116,7 @@ last_code = start_code + len(functional_key_names) - 1
 
 
 def patch_file(path: str, what: str, text: str, start_marker: str = '/* ', end_marker: str = ' */') -> None:
-    start_q = f'{start_marker}start {what}{end_marker}'
+    start_q = f'{start_marker}start {what} (auto generated by gen-key-constants.py do not edit){end_marker}'
     end_q = f'{start_marker}end {what}{end_marker}'
 
     with open(path, 'r+') as f:
diff --git a/glfw/glfw3.h b/glfw/glfw3.h
index 14f05eb7b..a1541d020 100644
--- a/glfw/glfw3.h
+++ b/glfw/glfw3.h
@@ -342,7 +342,7 @@ extern "C" {
  *  @{
  */
 
-/* start functional key names */
+/* start functional key names (auto generated by gen-key-constants.py do not edit) */
 typedef enum {
   GLFW_FKEY_FIRST = 0xe000,
   GLFW_FKEY_ESCAPE = 0xe000,