diff --git a/README.md b/README.md
index 984eea5..62b7180 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ See the [modules](./modules/README.md) README.
 ## Dependencies
 Some features require extra tools. Tools each module requires are listed below. If a module is disabled, its tool is not needed. Applications required by `core` MUST be installed.
 
- - Core: `fish`
+ - Core: `fish`, `sox` (and plugins)
  - Backlight: `xbacklight`
  - Battery: `upower`
  - Ibus: `ibus`