added comment

diff --git a/src/mesa/drivers/dri/common/drirenderbuffer.c b/src/mesa/drivers/dri/common/drirenderbuffer.c
index 3d9574f0cf228686855987b572f0e6b8cbf13355..44826958d0240ba334c03ecba0756f7c03c24b61 100644 (file)
--- a/src/mesa/drivers/dri/common/drirenderbuffer.c
+++ b/src/mesa/drivers/dri/common/drirenderbuffer.c
@@ -8,6 +8,8 @@
 /**
  * This will get called when a window is resized.
  * Just update width, height and internal format fields for now.
+ * There's usually no memory allocation above because the present
+ * DRI drivers use statically-allocated full-screen buffers.
  */
 static GLboolean
 driRenderbufferStorage(GLcontext *ctx, struct gl_renderbuffer *rb,