1 files changed, 1 insertions, 0 deletions
diff --git a/src/data.h b/src/data.h
index c3dc796..bba9f29 100644
--- a/src/data.h
+++ b/src/data.h
@@ -37,6 +37,7 @@ typedef struct rp_window_frame rp_window_frame;
 
 struct rp_window_frame
 {
+  int number;
   int x, y, width, height;
   rp_window *win;