diff --git a/toolbox/mm.cpp b/toolbox/mm.cpp
index 4069dd5..ba86594 100644
--- a/toolbox/mm.cpp
+++ b/toolbox/mm.cpp
@@ -562,6 +562,9 @@ namespace MM
 
 	uint16_t BlockMove(uint16_t trap)
 	{
+		// also implements BlockMoveData.
+		// BlockMove will flush caches, BlockMoveData will not.
+		
 		/* 
 		 * on entry:
 		 * A0 Pointer to source
diff --git a/toolbox/toolbox.cpp b/toolbox/toolbox.cpp
index 33aa27a..51bc531 100644
--- a/toolbox/toolbox.cpp
+++ b/toolbox/toolbox.cpp
@@ -223,7 +223,8 @@ namespace ToolBox {
 				break;
 
 			// BlockMove (sourcePtr,destPtr: Ptr; byteCount: Size);
-			case 0xa02e:
+			case 0xa02e: // BlockMove
+			case 0xa22e: // BlockMoveData
 				d0 = MM::BlockMove(trap);
 				break;