diff --git a/multimodalinput/kits/c/input/oh_input_manager.h b/multimodalinput/kits/c/input/oh_input_manager.h
index c23e8bf84dcadd7a8e8da43dfeca443347d10aaf..3934be3b9a6cb19b0627d706c5bd9dc89ee03dfb 100644
--- a/multimodalinput/kits/c/input/oh_input_manager.h
+++ b/multimodalinput/kits/c/input/oh_input_manager.h
@@ -265,6 +265,11 @@ typedef enum Input_Result {
      * @since 14
      */
     INPUT_OCCUPIED_BY_OTHER = 4200003,
+    /**
+     * @error No keyboard device connected
+     * @since 15
+     */
+    INPUT_KEYBOARD_DEVICE_NOT_EXIST = 3900002
 } Input_Result;
 
 /**
@@ -1827,6 +1832,7 @@ Input_Result OH_Input_GetDeviceAddress(Input_DeviceInfo *deviceInfo, char **addr
  * @return OH_Input_GetFunctionKeyState function api result code
  *         {@link INPUT_SUCCESS} if the operation is successful;
  *         {@link INPUT_PARAMETER_ERROR} if keyCode is invalid or state is a null pointer.
+ *         {@link INPUT_KEYBOARD_DEVICE_NOT_EXIST} no keyboard device connected.
  * @syscap SystemCapability.MultimodalInput.Input.Core
  * @since 15
  */