From 57c2e47cbf322b41dfb45d651451f2b2c38f2af9 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Sun, 18 Sep 2022 20:42:46 +1000
Subject: [PATCH] [doc] add comment to state that NvFBC reads NVFBC_PRIV_DATA
 if set

---
 doc/usage.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/usage.rst b/doc/usage.rst
index cba9f0ec..ff9ed732 100644
--- a/doc/usage.rst
+++ b/doc/usage.rst
@@ -577,3 +577,7 @@ The rules are written as follows:
 
   ; Downsample 3840x2160 to 1920x1080, or 3840x2400 to 1920x1200
   downsample=3840x2160:1920x1080,3840x2400:1920x1200
+
+This capture interface also looks for and reads the value of the system
+environment variable `NVFBC_PRIV_DATA` if it has been set, documentation on
+it's usage however is unavailble.