doc: document spilling options accepted by INTEL_DEBUG
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
diff --git a/docs/envvars.html b/docs/envvars.html
index e21b7c1..253aaf2 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -164,6 +164,8 @@
<li>nodualobj - suppress generation of dual-object geometry shader code</li>
<li>optimizer - dump shader assembly to files at each optimization pass and iteration that make progress</li>
<li>vec4 - force vec4 mode in vertex shader</li>
+ <li>spill_fs - force spilling of all registers in the scalar backend (useful to debug spilling code)</li>
+ <li>spill_vec4 - force spilling of all registers in the vec4 backend (useful to debug spilling code)</li>
</ul>
</ul>