diff --git a/docs/envvars.html b/docs/envvars.html
index 530bbb78696..1b2c03ef377 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -179,6 +179,8 @@ Mesa EGL supports different sets of environment variables.  See the
 <li>GALLIUM_HUD - draws various information on the screen, like framerate,
     cpu load, driver statistics, performance counters, etc.
     Set GALLIUM_HUD=help and run e.g. glxgears for more info.
+<li>GALLIUM_HUD_PERIOD - sets the hud update rate in seconds (float). Use zero
+    to update every frame. The default period is 1/2 second.
 <li>GALLIUM_HUD_VISIBLE - control default visibility, defaults to true.
 <li>GALLIUM_HUD_TOGGLE_SIGNAL - toggle visibility via user specified signal.
     Especially useful to toggle hud at specific points of application and