gallium/hud: document GALLIUM_HUD_PERIOD in envvars.html.
Signed-off-by: Marek Olšák <marek.olsak@amd.com>
diff --git a/docs/envvars.html b/docs/envvars.html
index 530bbb7..1b2c03e 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -179,6 +179,8 @@
<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