docs: document gallium mipmap generation fix
diff --git a/docs/relnotes-7.5.2.html b/docs/relnotes-7.5.2.html
index b638c05..40b4ae8 100644
--- a/docs/relnotes-7.5.2.html
+++ b/docs/relnotes-7.5.2.html
@@ -49,6 +49,7 @@
     (such as bug 23946)
 <li>glUseProgram() is now compiled into display lists (bug 23746).
 <li>glUniform functions are now compiled into display lists
+<li>Auto mipmap generation didn't work reliably with Gallium.
 </ul>