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-rw-r--r--nixpkgs/doc/using/overlays.xml1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/doc/using/overlays.xml b/nixpkgs/doc/using/overlays.xml
index 4937e9508857..caacb0a04622 100644
--- a/nixpkgs/doc/using/overlays.xml
+++ b/nixpkgs/doc/using/overlays.xml
@@ -28,6 +28,7 @@
    </para>
 
    <para>
+    NOTE: DO NOT USE THIS in nixpkgs.
     Further overlays can be added by calling the <literal>pkgs.extend</literal> or <literal>pkgs.appendOverlays</literal>, although it is often preferable to avoid these functions, because they recompute the Nixpkgs fixpoint, which is somewhat expensive to do.
    </para>
   </section>