diff --git a/th01/hardware/graph.h b/th01/hardware/graph.h
index 4aad8bb5..c064fa0c 100644
--- a/th01/hardware/graph.h
+++ b/th01/hardware/graph.h
@@ -24,8 +24,9 @@ void z_graph_clear_col(uint4_t col);
 // Fills page #0 with hardware color 0.
 void z_graph_clear_0(void);
 
-// Copies the content of the VRAM page that was previously set as the accessed
-// one via a call to graph_accesspage_func() to the opposite one.
+// Copies the content of the VRAM page that was set as the accessed one by the
+// last call to graph_accesspage_func() to the opposite one. Returns with the
+// accessed page unchanged.
 void graph_copy_accessed_page_to_other(void);
 /// -----
 
@@ -127,7 +128,9 @@ void graph_copy_byterect_from_accessed_page_to_other(
 //     (⌊left/8⌋*8, top)
 // on the [src] page to
 //     (⌊left/8⌋*8 + ⌊(right-left)/8⌋*8, bottom)
-// on the [dst] page. Already assumes [src] to be the currently accessed page.
+// on the [dst] page. Already assumes [src] to be the currently accessed page,
+// and returns with the accessed page equal to the one set by the last call to
+// graph_accesspage_func().
 void graph_move_byterect_interpage(
 	screen_x_t src_left,
 	vram_y_t src_top,