diff --git a/docs/manage/versions.md b/docs/manage/versions.md
index 3afc0c59..99f8f83d 100644
--- a/docs/manage/versions.md
+++ b/docs/manage/versions.md
@@ -80,7 +80,7 @@ asdf local <name> latest[:<version>]
 
 `global` writes the version to `$HOME/.tool-versions`.
 
-`shell` set the version to an environment variable named `ASDF_${LANG}_VERSION`, for the current shell session only.
+`shell` set the version to an environment variable named `ASDF_${TOOL}_VERSION`, for the current shell session only.
 
 `local` writes the version to `$PWD/.tool-versions`, creating it if needed.