diff --git a/image.go b/image.go
index 22e19f0f7..a825c07b6 100644
--- a/image.go
+++ b/image.go
@@ -323,7 +323,7 @@ type Vertex struct {
 
 	// SrcX and SrcY represents a point on a source image.
 	// Be careful that SrcX/SrcY coordinates are on the image's bounds.
-	// This means that a left-upper point of a sub-image might not be (0, 0).
+	// This means that a upper-left point of a sub-image might not be (0, 0).
 	SrcX float32
 	SrcY float32
 
@@ -615,8 +615,8 @@ func (i *Image) DrawTrianglesShader(vertices []Vertex, indices []uint16, shader
 		}
 		b := img.Bounds()
 		x, y := img.adjustPosition(b.Min.X, b.Min.Y)
-		// (sx, sy) is the left-upper position of the first image.
-		// Calculate the distance between the current image's left-upper position and the first one's.
+		// (sx, sy) is the upper-left position of the first image.
+		// Calculate the distance between the current image's upper-left position and the first one's.
 		offsets[i][0] = float32(x - sx)
 		offsets[i][1] = float32(y - sy)
 	}
@@ -717,8 +717,8 @@ func (i *Image) DrawRectShader(width, height int, shader *Shader, options *DrawR
 		}
 		b := img.Bounds()
 		x, y := img.adjustPosition(b.Min.X, b.Min.Y)
-		// (sx, sy) is the left-upper position of the first image.
-		// Calculate the distance between the current image's left-upper position and the first one's.
+		// (sx, sy) is the upper-left position of the first image.
+		// Calculate the distance between the current image's upper-left position and the first one's.
 		offsets[i][0] = float32(x - sx)
 		offsets[i][1] = float32(y - sy)
 	}
@@ -986,7 +986,7 @@ type NewImageOptions struct {
 //
 // The rendering origin position is (0, 0) of the given bounds.
 // If DrawImage is called on a new image created by NewImageOptions,
-// for example, the center of scaling and rotating is (0, 0), that might not be a left-upper position.
+// for example, the center of scaling and rotating is (0, 0), that might not be a upper-left position.
 //
 // If options is nil, the default setting is used.
 //
@@ -1034,7 +1034,7 @@ func newImage(bounds image.Rectangle, imageType atlas.ImageType) *Image {
 //
 // NewImageFromImage panics if RunGame already finishes.
 //
-// The returned image's left-upper position is always (0, 0). The source's bounds are not respected.
+// The returned image's upper-left position is always (0, 0). The source's bounds are not respected.
 func NewImageFromImage(source image.Image) *Image {
 	return NewImageFromImageWithOptions(source, nil)
 }
@@ -1050,7 +1050,7 @@ type NewImageFromImageOptions struct {
 	Unmanaged bool
 
 	// PreserveBounds represents whether the new image's bounds are the same as the given image.
-	// The default (zero) value is false, that means the new image's left-upper position is adjusted to (0, 0).
+	// The default (zero) value is false, that means the new image's upper-left position is adjusted to (0, 0).
 	PreserveBounds bool
 }
 
diff --git a/text/text.go b/text/text.go
index b85da38c1..0a3cbab54 100644
--- a/text/text.go
+++ b/text/text.go
@@ -149,7 +149,7 @@ var textM sync.Mutex
 // (x, y) represents a 'dot' (period) position.
 // This means that if the given text consisted of a single character ".",
 // it would be positioned at the given position (x, y).
-// Be careful that this doesn't represent left-upper corner position.
+// Be careful that this doesn't represent upper-left corner position.
 //
 // clr is the color for text rendering.
 //
@@ -190,7 +190,7 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
 // face is the font for text rendering.
 // op is the options to draw glyph images.
 // The origin point is a 'dot' (period) position.
-// Be careful that the origin point is not left-upper corner position of dst.
+// Be careful that the origin point is not upper-left corner position of dst.
 // The default glyph color is while. op's ColorM adjusts the color.
 //
 // If you want to adjust the position of the text, these functions are useful:
diff --git a/window.go b/window.go
index a768de982..364d2a03a 100644
--- a/window.go
+++ b/window.go
@@ -131,7 +131,7 @@ func SetWindowIcon(iconImages []image.Image) {
 }
 
 // WindowPosition returns the window position.
-// The origin position is the left-upper corner of the current monitor.
+// The origin position is the upper-left corner of the current monitor.
 // The unit is device-independent pixels.
 //
 // WindowPosition panics if the main loop does not start yet.
@@ -146,7 +146,7 @@ func WindowPosition() (x, y int) {
 }
 
 // SetWindowPosition sets the window position.
-// The origin position is the left-upper corner of the current monitor.
+// The origin position is the upper-left corner of the current monitor.
 // The unit is device-independent pixels.
 //
 // SetWindowPosition sets the original window position in fullscreen mode.