diff --git a/include/osg/Geometry b/include/osg/Geometry
index 817790cfe..7214a21b1 100644
--- a/include/osg/Geometry
+++ b/include/osg/Geometry
@@ -327,9 +327,11 @@ class OSG_EXPORT Geometry : public Drawable
         bool getFastPathHint() const { return _fastPathHint; }
 
         /** Return true if OpenGL fast paths will be used with drawing this Geometry.
-          * Fast paths use vertex arrays, and glDrawArrays/glDrawElements.  Slow paths
-          * use glBegin()/glVertex.../glEnd(). Use of per primitive bindings or per vertex indexed
-          * arrays will drop the rendering path off the fast path.
+          * Fast paths directly use vertex arrays, and glDrawArrays/glDrawElements so have low CPU overhead.
+          * With Slow paths the osg::Geometry::drawImplementation has to dynamically assemble OpenGL
+          * compatible vertex arrays from the osg::Geometry arrays data and then dispatch these to OpenGL,
+          * so have higher CPU overhead than the Fast paths.
+          * Use of per primitive bindings or per vertex indexed arrays will drop the rendering path off the fast path.
         */
         inline bool areFastPathsUsed() const
         {