diff --git a/multimodalinput/kits/c/input/oh_key_code.h b/multimodalinput/kits/c/input/oh_key_code.h
index 32b3b9bcfb6a773d9941da6256cf6c727101e41d..710b84d2479d7d57545f3abe7e8ccaf39c0cdbbe 100644
--- a/multimodalinput/kits/c/input/oh_key_code.h
+++ b/multimodalinput/kits/c/input/oh_key_code.h
@@ -49,6 +49,11 @@ typedef enum {
     KEYCODE_UNKNOWN = -1,
     /** Function (Fn) key */
     KEYCODE_FN = 0,
+    /**
+     * Headsethook key
+     * @since 20
+     */
+    KEYCODE_HEADSETHOOK = 6,
     /** Volume Up key */
     KEYCODE_VOLUME_UP = 16,
     /** Volume Down button */