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-rw-r--r--doc/guix.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 746561ed97..a934626e5a 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -13988,6 +13988,9 @@ When @code{auto-login?} is false, GDM presents a log-in screen.
 When @code{auto-login?} is true, GDM logs in directly as
 @code{default-user}.
 
+@item @code{debug?} (default: @code{#f})
+When true, GDM writes debug messages to its log.
+
 @item @code{gnome-shell-assets} (default: ...)
 List of GNOME Shell assets needed by GDM: icon theme, fonts, etc.