docs: update envvars.html to reflect having a cache per arch

diff --git a/docs/envvars.html b/docs/envvars.html
index 9f1f70858d8752eab1dbbcd9d533780927db0192..aa56cd1a9f4e638501bce36116ac63fe14c92589 100644 (file)
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -119,7 +119,10 @@ if it's higher than what's normally reported. (for developers only)
 the on-disk cache of compiled GLSL programs. Should be set to a number
 optionally followed by 'K', 'M', or 'G' to specify a size in
 kilobytes, megabytes, or gigabytes. By default, gigabytes will be
-assumed. And if unset, a maximum size of 1GB will be used.
+assumed. And if unset, a maximum size of 1GB will be used. Note: A separate
+cache might be created for each architecture that Mesa is installed for on
+your system. For example under the default settings you may end up with a 1GB
+cache for x86_64 and another 1GB cache for i386.
 <li>MESA_GLSL_CACHE_DIR - if set, determines the directory to be used
 for the on-disk cache of compiled GLSL programs. If this variable is
 not set, then the cache will be stored in $XDG_CACHE_HOME/mesa (if