diff --git a/ssd1306.h b/ssd1306.h
--- a/ssd1306.h
+++ b/ssd1306.h
@@ -13,5 +13,6 @@ unsigned char ssd1306_SetContrast(unsign
 unsigned char ssd1306_GetContrast();
 unsigned char* ssd1306_GetBuffer();
 unsigned long ssd1306_DrawPoint(Pos_t x, Pos_t y, Color_t color);
+void ssd1306_block_write(void);
 
 #endif