diff --git a/colorm.go b/colorm.go
index b82d68484..ea69b14fd 100644
--- a/colorm.go
+++ b/colorm.go
@@ -20,7 +20,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/affine"
 )
 
-// ColorMDim is a dimension of a ColorM.
+// ColorMDim is the dimension of a ColorM.
 //
 // Deprecated: as of v2.5. Use the colorm package instead.
 const ColorMDim = affine.ColorMDim
diff --git a/colorm/colorm.go b/colorm/colorm.go
index a3e1f0bee..8da54783c 100644
--- a/colorm/colorm.go
+++ b/colorm/colorm.go
@@ -24,7 +24,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/builtinshader"
 )
 
-// Dim is a dimension of a ColorM.
+// Dim is the dimension of a ColorM.
 const Dim = affine.ColorMDim
 
 // ColorM represents a matrix to transform coloring when rendering an image.