A comment extended.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2345 3789f03b-4d11-0410-bbf8-ca57d06f2519

unix/x0vncserver/PollingManager.cxx

@@ -243,7 +243,7 @@ bool PollingManager::poll_New()
 
   // mxChanged[] array will hold boolean values corresponding to each
   // 32x32 tile. If a value is true, then we've detected a change in
-  // that tile.
+  // that tile. Initially, we fill in the array with zero values.
   bool *mxChanged = new bool[m_widthTiles * m_heightTiles];
   memset(mxChanged, 0, m_widthTiles * m_heightTiles);