diff --git a/Adafruit_GFX.cpp b/Adafruit_GFX.cpp
index af989002..0cc48789 100644
--- a/Adafruit_GFX.cpp
+++ b/Adafruit_GFX.cpp
@@ -172,6 +172,20 @@ void Adafruit_GFX::writeLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
   }
 }
 
+/**************************************************************************/
+/*!
+   @brief    Clear the display, overwrite in subclasses.
+*/
+/**************************************************************************/
+void Adafruit_GFX::clearDisplay() {}
+
+/**************************************************************************/
+/*!
+   @brief    Update the display, overwrite in subclasses.
+*/
+/**************************************************************************/
+void Adafruit_GFX::display() {}
+
 /**************************************************************************/
 /*!
    @brief    Start a display-writing routine, overwrite in subclasses.
diff --git a/Adafruit_GFX.h b/Adafruit_GFX.h
index 63c6ab68..c363641a 100644
--- a/Adafruit_GFX.h
+++ b/Adafruit_GFX.h
@@ -10,7 +10,9 @@
 #include "gfxfont.h"
 
 #include <Adafruit_I2CDevice.h>
+#ifndef SKIP_SPI
 #include <Adafruit_SPIDevice.h>
+#endif
 
 /// A generic graphics superclass that can handle all sorts of drawing. At a
 /// minimum you can subclass and provide drawPixel(). At a maximum you can do a
@@ -43,6 +45,8 @@ class Adafruit_GFX : public Print {
   virtual void writeLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1,
                          uint16_t color);
   virtual void endWrite(void);
+  virtual void clearDisplay(void);
+  virtual void display(void);
 
   // CONTROL API
   // These MAY be overridden by the subclass to provide device-specific