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diff --git a/docs/envvars.html b/docs/envvars.html
index 7cda0e4898..12e44e288a 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -32,6 +32,7 @@ software driver:
<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
"window" to render into a window, or "disable" to disable the Glide driver.
<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
+<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
</ul>