diff --git a/common/rfb/SMsgHandler.h b/common/rfb/SMsgHandler.h
index 0b1fd7e..c21cf52 100644
--- a/common/rfb/SMsgHandler.h
+++ b/common/rfb/SMsgHandler.h
@@ -51,6 +51,8 @@
     virtual void setDesktopSize(int fb_width, int fb_height,
                                 const ScreenSet& layout) = 0;
     virtual void fence(rdr::U32 flags, unsigned len, const char data[]) = 0;
+    virtual void enableContinuousUpdates(bool enable,
+                                         int x, int y, int w, int h) = 0;
 
     // InputHandler interface
     // The InputHandler methods will be called for the corresponding messages.
@@ -66,6 +68,12 @@
     // the client of server support.
     virtual void supportsFence();
 
+    // supportsContinuousUpdates() is called the first time we detect that
+    // the client wants the continuous updates extension. A
+    // EndOfContinuousUpdates message should be sent back to the client at
+    // this point if it is supported.
+    virtual void supportsContinuousUpdates();
+
     ConnParams cp;
   };
 }