added a renderbuffer comment

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index bced1a6..321adfe 100644 (file)
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2169,7 +2169,7 @@ struct gl_renderbuffer
    GLubyte IndexBits;
    GLubyte DepthBits;
    GLubyte StencilBits;
-   GLvoid *Data;
+   GLvoid *Data;        /**< This may not be used by some kinds of RBs */
 
    /* Used to wrap one renderbuffer around another: */
    struct gl_renderbuffer *Wrapped;