diff --git a/Cheat-Sheet.md b/Cheat-Sheet.md
index 3f7ce84..bb73169 100644
--- a/Cheat-Sheet.md
+++ b/Cheat-Sheet.md
@@ -186,7 +186,8 @@ When the given image is as same as `i`, DrawImage panics.
 `DrawImage` works more efficiently as batches when the successive calls of `DrawImages` satisfies the below conditions:
 
 * All render targets are same (`A` in `A.DrawImage(B, op)`)
-* All ColorM values are same, or all the ColorM have only 'scale' operations
+* Either all ColorM element values are same or all the ColorM have only diagonal ('scale') elements
+  * (*ColorM).Scale modifies only diagonal elements. Other ColorM functions might modify the other elements.
 * All CompositeMode values are same
 * All Filter values are same