diff --git a/.env.example b/.env.example
index 1bb2a04..bce7bd8 100644
--- a/.env.example
+++ b/.env.example
@@ -72,7 +72,7 @@ S3_BUCKET=
 # COMPUTE_WORKER_URL=http://localhost:8081
 # COMPUTE_WORKER_TOKEN=local-compute-token
 
-# (Optional) Override ffmpeg binary path used for audiobook processing
+# (Optional) Override ffmpeg binary path used for audio processing
 # FFMPEG_BIN=
 
 # (Optional) Test/dev overrides
diff --git a/docs-site/docs/reference/environment-variables.md b/docs-site/docs/reference/environment-variables.md
index 3d9ebd8..4e98f8a 100644
--- a/docs-site/docs/reference/environment-variables.md
+++ b/docs-site/docs/reference/environment-variables.md
@@ -348,7 +348,9 @@ There are no dedicated env vars for these runtime settings.
 
 ### FFMPEG_BIN
 
-Override ffmpeg binary path used for audiobook processing.
+Override ffmpeg binary path used for audio processing.
+
+- Used by audiobook processing routes and compute worker Whisper audio decode.
 
 ## Testing and CI