diff --git a/ili9341/ili9341.go b/ili9341/ili9341.go
index d19b4e1..6673fcf 100644
--- a/ili9341/ili9341.go
+++ b/ili9341/ili9341.go
@@ -20,7 +20,7 @@ type Device struct {
 	driver   driver
 
 	x0, x1 int16 // cached address window; prevents useless/expensive
-	y0, y1 int16 // syscalls to PASET, CASET, and RAMWR
+	y0, y1 int16 // syscalls to PASET and CASET
 
 	dc  machine.Pin
 	cs  machine.Pin
@@ -28,6 +28,7 @@ type Device struct {
 	rd  machine.Pin
 }
 
+// Configure prepares display for use
 func (d *Device) Configure(config Config) {
 
 	if config.Width == 0 {
@@ -145,6 +146,7 @@ func (d *Device) Display() error {
 	return nil
 }
 
+// DrawRGBBitmap copies an RGB bitmap to the internal buffer at given coordinates
 func (d *Device) DrawRGBBitmap(x, y int16, data []uint16, w, h int16) error {
 	k, i := d.Size()
 	if x < 0 || y < 0 || w <= 0 || h <= 0 ||
@@ -158,7 +160,7 @@ func (d *Device) DrawRGBBitmap(x, y int16, data []uint16, w, h int16) error {
 	return nil
 }
 
-// FillRectangle fills a rectangle at a given coordinates with a color
+// FillRectangle fills a rectangle at given coordinates with a color
 func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
 	k, i := d.Size()
 	if x < 0 || y < 0 || width <= 0 || height <= 0 ||
@@ -173,7 +175,7 @@ func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
 	return nil
 }
 
-// DrawRectangle fills a rectangle at a given coordinates with a color
+// DrawRectangle draws a rectangle at given coordinates with a color
 func (d *Device) DrawRectangle(x, y, w, h int16, c color.RGBA) error {
 	if err := d.DrawFastHLine(x, x+w-1, y, c); err != nil {
 		return err
@@ -215,6 +217,7 @@ func (d *Device) FillScreen(c color.RGBA) {
 	}
 }
 
+// GetRotation returns the current rotation of the device
 func (d *Device) GetRotation() Rotation {
 	return d.rotation
 }
@@ -236,7 +239,8 @@ func (d *Device) SetRotation(rotation Rotation) {
 	d.rotation = rotation
 }
 
-// SetScrollWindow sets an area to scroll with fixed top and bottom parts of the display
+// SetScrollArea sets an area to scroll with fixed top/bottom or left/right parts of the display
+// Rotation affects scroll direction
 func (d *Device) SetScrollArea(topFixedArea, bottomFixedArea int16) {
 	d.sendCommand(VSCRDEF, []uint8{
 		uint8(topFixedArea >> 8), uint8(topFixedArea),
@@ -251,7 +255,7 @@ func (d *Device) SetScroll(line int16) {
 	d.sendCommand(VSCRSADD, []uint8{uint8(line >> 8), uint8(line)})
 }
 
-// SpotScroll returns the display to its normal state
+// StopScroll returns the display to its normal state
 func (d *Device) StopScroll() {
 	d.sendCommand(NORON, nil)
 }
@@ -260,10 +264,8 @@ func (d *Device) StopScroll() {
 func (d *Device) setWindow(x, y, w, h int16) {
 	//x += d.columnOffset
 	//y += d.rowOffset
-	wr := false
 	x1 := x + w - 1
 	if x != d.x0 || x1 != d.x1 {
-		wr = true
 		d.sendCommand(CASET, []uint8{
 			uint8(x >> 8), uint8(x), uint8(x1 >> 8), uint8(x1),
 		})
@@ -271,15 +273,12 @@ func (d *Device) setWindow(x, y, w, h int16) {
 	}
 	y1 := y + h - 1
 	if y != d.y0 || y1 != d.y1 {
-		wr = true
 		d.sendCommand(PASET, []uint8{
 			uint8(y >> 8), uint8(y), uint8(y1 >> 8), uint8(y1),
 		})
 		d.y0, d.y1 = y, y1
 	}
-	if wr {
-		d.sendCommand(RAMWR, nil)
-	}
+	d.sendCommand(RAMWR, nil)
 }
 
 //go:inline