1 files changed, 11 insertions, 0 deletions

diff --git a/swaygrab/swaygrab.1.txt b/swaygrab/swaygrab.1.txt
index b2c6389a..1da56db8 100644
--- a/swaygrab/swaygrab.1.txt
+++ b/swaygrab/swaygrab.1.txt
@@ -48,6 +48,13 @@ Options
 *-f, --focused*::
         Capture only the currently focused container.
 
+Environment Variables
+---------------------
+swaygrab reads the following environment variables.
+
+*SWAYGRAB_FFMPEG_OPTS*::
+        Pass additional arguments to FFmpeg when starting a capture.
+
 Examples
 --------
 
@@ -57,6 +64,10 @@ swaygrab output.png::
 swaygrab -c -o HDMI-A-1 output.webm::
         Capture a webm of HDMI-A-1.
 
+SWAYGRAB_FFMPEG_OPTS="-f alsa -i pulse" swaygrab -c::
+        Capture the focused output and encode audio from the default recording
+        device.
+
 Authors
 -------