diff --git a/th01/hardware/graph.cpp b/th01/hardware/graph.cpp
index 6083570b..7df4039c 100644
--- a/th01/hardware/graph.cpp
+++ b/th01/hardware/graph.cpp
@@ -371,7 +371,7 @@ void z_grcg_pset(int x, int y, int col)
 	grcg_off_func();
 }
 
-int z_col_at(int x, int y)
+int z_graph_readdot(int x, int y)
 {
 	int ret;
 	int vram_offset = ((y * ROW_SIZE) + (x >> 3));
diff --git a/th01/hardware/graph.h b/th01/hardware/graph.h
index 21d6b018..5c7470c0 100644
--- a/th01/hardware/graph.h
+++ b/th01/hardware/graph.h
@@ -42,7 +42,7 @@ void z_grcg_boxfill(int left, int top, int right, int bottom, int col);
 /// ------
 void z_grcg_pset(int x, int y, int col);
 // Returns the color value at the given point on the current VRAM page.
-int z_col_at(int x, int y);
+int z_graph_readdot(int x, int y);
 /// ------
 
 /// Restorable line drawing