diff --git a/README.md b/README.md
index 12ff645..a70e100 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,8 @@ We appreciate filed issues, pull requests and general discussion.
 Spacedeck requires:
 
 - Node.js 10.x: Web Server / API. Download: https://nodejs.org
-- Graphicsmagick. Download: http://www.graphicsmagick.org/
+- Graphicsmagick. On non-Linux, Download: http://www.graphicsmagick.org/ On Linux, install via package manager.
+- Optionally ffmpeg, audiowaveform and ghostscript. See "Optional Dependencies" below.
 
 To run Spacedeck, you only need Node.JS 10.x.