diff --git a/README.md b/README.md
index 20caaeb..7523759 100644
--- a/README.md
+++ b/README.md
@@ -242,6 +242,14 @@ This environment var is used by aws-cli and other tools to use the right access
 
 The git prompt can be disabled for a specific repository by setting a git config flag: `get config oh-my-zsh.hide-status 1`. This is useful to avoid performance issues for particularly huge repositories.
 
+### Screen
+
+|Variable|Default|Meaning
+|--------|-------|-------|
+|`BULLETTRAIN_SCREEN_BG`|`white`|Background color
+|`BULLETTRAIN_SCREEN_FG`|`black`|Foreground color
+|`BULLETTRAIN_SCREEN_PREFIX`|`⚙`|Prefix of the segment
+
 ### Mercurial/HG
 
 |Variable|Default|Meaning