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diff --git a/docs/envvars.html b/docs/envvars.html
index 39bd7251dec..7cda0e48987 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -31,6 +31,7 @@ software driver:
<li>MESA_GLX_FORCE_CI - if set, force GLX to treak 8bpp visuals as CI visuals
<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.
</ul>