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-rw-r--r--docs/env_vars.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/env_vars.md b/docs/env_vars.md
index e0e10fab..6e6f846a 100644
--- a/docs/env_vars.md
+++ b/docs/env_vars.md
@@ -41,3 +41,4 @@ wlroots reads these environment variables
* *WAYLAND_DISPLAY*, *_WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland
backend in *wlr_backend_autocreate*
* *XCURSOR_PATH*: directory where xcursors are located
+* *XDG_SESSION_ID*: if set, session ID used by the logind session