diff --git a/include/osgParticle/ParticleSystem b/include/osgParticle/ParticleSystem
index 1012e4867..6617adbf6 100644
--- a/include/osgParticle/ParticleSystem
+++ b/include/osgParticle/ParticleSystem
@@ -83,7 +83,10 @@ namespace osgParticle
             WORLD_COORDINATES
         };
 
+        /** Set whether the particles should be scaled relative to world coordaintes or local coordinates.*/
         void setParticleScaleReferenceFrame(ParticleScaleReferenceFrame rf) { _particleScaleReferenceFrame = rf; }
+
+        /** Get whether the particles should be scaled relative to world coordaintes or local coordinates.*/
         ParticleScaleReferenceFrame getParticleScaleReferenceFrame() const { return _particleScaleReferenceFrame; }