Index: uspace/lib/memgfx/include/memgfx/memgc.h
===================================================================
--- uspace/lib/memgfx/include/memgfx/memgc.h	(revision dbef30fb1faefbb940d9c7275e085e71216fe08b)
+++ uspace/lib/memgfx/include/memgfx/memgc.h	(revision cd74fa821c3e13e287082a3dd6e4d121434cd360)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2020 Jiri Svoboda
+ * Copyright (c) 2021 Jiri Svoboda
  * All rights reserved.
  *
@@ -46,5 +46,5 @@
 
 extern errno_t mem_gc_create(gfx_rect_t *, gfx_bitmap_alloc_t *,
-    mem_gc_update_cb_t, void *, mem_gc_t **);
+    mem_gc_invalidate_cb_t, mem_gc_update_cb_t, void *, mem_gc_t **);
 extern errno_t mem_gc_delete(mem_gc_t *);
 extern void mem_gc_retarget(mem_gc_t *, gfx_rect_t *, gfx_bitmap_alloc_t *);
Index: uspace/lib/memgfx/include/types/memgfx/memgc.h
===================================================================
--- uspace/lib/memgfx/include/types/memgfx/memgc.h	(revision dbef30fb1faefbb940d9c7275e085e71216fe08b)
+++ uspace/lib/memgfx/include/types/memgfx/memgc.h	(revision cd74fa821c3e13e287082a3dd6e4d121434cd360)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2020 Jiri Svoboda
+ * Copyright (c) 2021 Jiri Svoboda
  * All rights reserved.
  *
@@ -42,5 +42,6 @@
 typedef struct mem_gc mem_gc_t;
 
-typedef void (*mem_gc_update_cb_t)(void *, gfx_rect_t *);
+typedef void (*mem_gc_invalidate_cb_t)(void *, gfx_rect_t *);
+typedef void (*mem_gc_update_cb_t)(void *);
 
 #endif