diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index 4d9942ba899..a8c0b8ee8b9 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -406,6 +406,10 @@ incomplete(struct gl_texture_object *t, const char *fmt, ...)
  * The gl_texture_object::Complete flag will be set to GL_TRUE or GL_FALSE
  * accordingly.
  *
+ * XXX TODO: For immutable textures (GL_ARB_texture_storage) we can skip
+ * many of the checks below since we know the mipmap images will have
+ * consistent sizes.
+ *
  * \param ctx GL context.
  * \param t texture object.
  *