docs: document INTEL_PRECISE_TRIG envvar
v2: use more generic description (Jordan)
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
diff --git a/docs/envvars.html b/docs/envvars.html
index 9eee8db..276cea3 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -187,6 +187,8 @@
<li>do32 - generate compute shader SIMD32 programs even if workgroup size doesn't exceed the SIMD16 limit</li>
<li>norbc - disable single sampled render buffer compression</li>
</ul>
+<li>INTEL_PRECISE_TRIG - if set to 1, true or yes, then the driver prefers
+ accuracy over performance in trig functions.</li>
</ul>