diff --git a/rfb/ScaledPixelBuffer.h b/rfb/ScaledPixelBuffer.h
index f7243e1..3b6aa7e 100644
--- a/rfb/ScaledPixelBuffer.h
+++ b/rfb/ScaledPixelBuffer.h
@@ -63,6 +63,12 @@
     inline Rect calculateScaleBoundary(const Rect& r);
 
   protected:
+
+    // Calculate the scaled buffer size depending on the source buffer
+    // parameters (width, height, pixel format)
+    void calculateScaledBufferSize();
+
+    // Recreate the scaled pixel buffer
     virtual void recreateScaledBuffer();
 
     int src_width;