diff --git a/render.c b/render.c
index 9109c29d..2b86fe69 100644
--- a/render.c
+++ b/render.c
@@ -1279,6 +1279,7 @@ grid_render(struct terminal *term)
         term->render.was_searching = term->is_searching;
     }
 
+    /* Set clip region to prevent cells from overflowing into the margins */
     pixman_region16_t clip;
     pixman_region_init_rect(
         &clip,