diff --git a/WrapAroundDemo/README.md b/WrapAroundDemo/README.md
index 716607e..6c450f5 100644
--- a/WrapAroundDemo/README.md
+++ b/WrapAroundDemo/README.md
@@ -2,3 +2,44 @@
 
 ![RoteteDemo](https://user-images.githubusercontent.com/6020549/165236460-e1fd757c-dcff-4601-bce1-b533599b5fc5.JPG)
 
+A 128x32 panel has 4 pages of internal memory, and a 128x64 panel has 8 pages of internal memory.
+PAGE_SCROLL_DOWN/PAGE_SCROLL_UP is page-by-page scrolling and works fast.   
+
+```
++--------+
+| Page 1 |
++--------+
+| Page 2 |
++--------+
+| Page 3 |
++--------+
+| Page 4 |
++--------+
+| Page 5 |
++--------+
+| Page 6 |
++--------+
+| Page 7 |
++--------+
+| Page 8 |
++--------+
+
++--------+
+| Page 2 |
++--------+
+| Page 3 |
++--------+
+| Page 4 |
++--------+
+| Page 5 |
++--------+
+| Page 6 |
++--------+
+| Page 7 |
++--------+
+| Page 8 |
++--------+
+| Page 1 |
++--------+
+```
+
diff --git a/WrapAroundDemo/main/main.c b/WrapAroundDemo/main/main.c
index 17d7f3b..057e157 100644
--- a/WrapAroundDemo/main/main.c
+++ b/WrapAroundDemo/main/main.c
@@ -107,14 +107,14 @@ void app_main(void)
 		ESP_LOGD(TAG, "height=%d", height);
 		for(int i=0;i<height;i++) {
 			ssd1306_wrap_arround(&dev, SCROLL_UP, 0, 31, 0);
-			ssd1306_wrap_arround(&dev, SCROLL_UP, 96, 127, 0);
+			ssd1306_wrap_arround(&dev, SCROLL_DOWN, 96, 127, 0);
 		}
 		vTaskDelay(2000 / portTICK_PERIOD_MS);
 
 		ESP_LOGD(TAG, "height=%d", height);
 		for(int i=0;i<height;i++) {
 			ssd1306_wrap_arround(&dev, SCROLL_DOWN, 0, 31, 0);
-			ssd1306_wrap_arround(&dev, SCROLL_DOWN, 96, 127, 0);
+			ssd1306_wrap_arround(&dev, SCROLL_UP, 96, 127, 0);
 		}
 		vTaskDelay(2000 / portTICK_PERIOD_MS);
 
@@ -129,5 +129,18 @@ void app_main(void)
 			ssd1306_wrap_arround(&dev, SCROLL_UP, 0, 127, 0);
 		}
 		vTaskDelay(2000 / portTICK_PERIOD_MS);
+
+		// PAGE_SCROLL is only a Byte operation, so it's very fast
+		for(int i=0;i<=pages;i++) {
+			ssd1306_wrap_arround(&dev, PAGE_SCROLL_DOWN, 0, 0, 0);
+			vTaskDelay(2);
+		}
+		vTaskDelay(1000 / portTICK_PERIOD_MS);
+
+		for(int i=0;i<=pages;i++) {
+			ssd1306_wrap_arround(&dev, PAGE_SCROLL_UP, 0, 0, 0);
+			vTaskDelay(2);
+		}
+		vTaskDelay(2000 / portTICK_PERIOD_MS);
 	} // end while
 }