message: Added some comment
diff: @@ -78,7 +78,12 @@ public:
  void SetNumPatchVertices( Int32 NumVertices);
  void Invalidate();
  - void InvalidateVAO(){m_VAOId = -1;}
  + void InvalidateVAO()
  + {
  + m_VAOId = -1;
  + // Resetting VAO after that with BindVAO(GLVertexArrayObj::Null()) will still have the effect because
  + // null VAO's ID is 0, not -1.
  + }
  bool IsValidVAOBound()const {return m_VAOId > 0;}
  void SetCurrentGLContext(GLContext::NativeGLContextType Context) { m_CurrentGLContext = Context; }
  