diff --git a/README.md b/README.md
index 3401a0c8..81dc111b 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,8 @@ This software is licensed under the LGPL v3 .
   - aspell-YourLanguageCode (example aspell-en for us english)
 2. unix daemon (also needed for systemd):
   - python-daemonize
+3. Modify system volume:
+  - pyalsaaudio (needs libasound2's headers).
 
 # installation
 - Archlinux: PKGBUILD in AUR