diff --git a/colorscale.go b/colorscale.go
index 563e65136..936a2cda0 100644
--- a/colorscale.go
+++ b/colorscale.go
@@ -90,7 +90,7 @@ func (c *ColorScale) SetA(a float32) {
 //
 // Scale is slightly different from colorm.ColorM's Scale in terms of alphas.
 // ColorScale is applied to premultiplied-alpha colors, while colorm.ColorM is applied to straight-alpha colors.
-// Thus, colorm.ColorM.Scale(r, g, b, a) equals to ColorScale.Scale(r*a, g*a, b*a, a).
+// Thus, ColorM.Scale(r, g, b, a) equals to ColorScale.Scale(r*a, g*a, b*a, a).
 func (c *ColorScale) Scale(r, g, b, a float32) {
 	c.r_1 = (c.r_1+1)*r - 1
 	c.g_1 = (c.g_1+1)*g - 1
diff --git a/image.go b/image.go
index 8935987c1..4543ba6af 100644
--- a/image.go
+++ b/image.go
@@ -114,7 +114,7 @@ type DrawImageOptions struct {
 	//
 	// ColorScale is slightly different from colorm.ColorM's Scale in terms of alphas.
 	// ColorScale is applied to premultiplied-alpha colors, while colorm.ColorM is applied to straight-alpha colors.
-	// Thus, colorm.ColorM.Scale(r, g, b, a) equals to ColorScale.Scale(r*a, g*a, b*a, a).
+	// Thus, ColorM.Scale(r, g, b, a) equals to ColorScale.Scale(r*a, g*a, b*a, a).
 	//
 	// The default (zero) value is identity, which is (1, 1, 1, 1).
 	ColorScale ColorScale