diff --git a/docs/xlibdriver.rst b/docs/xlibdriver.rst
index 8a7a58bc5f55e..82493fcc368a7 100644
--- a/docs/xlibdriver.rst
+++ b/docs/xlibdriver.rst
@@ -170,6 +170,3 @@ Summary of X-related environment variables
 | :envvar:`MESA_BACK_BUFFER`  | specifies how to implement the back  |
 |                             | color buffer (X only)                |
 +-----------------------------+--------------------------------------+
-| :envvar:`MESA_GAMMA`        | gamma correction coefficients        |
-|                             | (X only)                             |
-+-----------------------------+--------------------------------------+