added comment

diff --git a/src/mesa/pipe/draw/draw_private.h b/src/mesa/pipe/draw/draw_private.h
index 7e5d5db5ab911576e620cf337920cc03d2a77ed9..b7811e891e7f262b581a088cbb175f3113bdb77b 100644 (file)
--- a/src/mesa/pipe/draw/draw_private.h
+++ b/src/mesa/pipe/draw/draw_private.h
@@ -192,7 +192,7 @@ struct draw_context
    /* Post-tnl vertex cache:
     */
    struct {
-      unsigned referenced;
+      unsigned referenced;  /**< bitfield */
       unsigned idx[VCACHE_SIZE + VCACHE_OVERFLOW];
       struct vertex_header *vertex[VCACHE_SIZE + VCACHE_OVERFLOW];
       unsigned overflow;