diff --git a/compose/reference/envvars.md b/compose/reference/envvars.md
index 2597861fb4..12b160f559 100644
--- a/compose/reference/envvars.md
+++ b/compose/reference/envvars.md
@@ -82,7 +82,8 @@ Supported values are: `TLSv1`, `TLSv1_1`, `TLSv1_2`.
 ## COMPOSE\_CONVERT\_WINDOWS\_PATHS
 
 Enable path conversion from Windows-style to Unix-style in volume definitions.
-Users of Docker Machine and Docker Toolbox on Windows should always set this.
+Users of Docker Machine and Docker Toolbox on Windows should always set this. Defaults to `0`
+Supported values: `true` or `1` to enable, `false` or `0` to disable.
 
 
 ## Related Information