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-rw-r--r--mesalib/docs/envvars.html4
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diff --git a/mesalib/docs/envvars.html b/mesalib/docs/envvars.html
index 986d2f8eb..6402ec507 100644
--- a/mesalib/docs/envvars.html
+++ b/mesalib/docs/envvars.html
@@ -58,6 +58,10 @@ copied into a fixed-size buffer without truncating.
If the extension string is too long, the buffer overrun can cause the game
to crash.
This is a work-around for that.
+<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
+glGetString(GL_VERSION). Valid values are point-separated version numbers,
+such as "3.0". Mesa will not really implement all the features of the given
+version if it's higher than what's normally reported.
<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
</ul>