diff --git a/units/debug-shell.service.in b/units/debug-shell.service.in
index 2d48faa105..1127e68b63 100644
--- a/units/debug-shell.service.in
+++ b/units/debug-shell.service.in
@@ -10,6 +10,7 @@
 [Unit]
 Description=Early root shell on @DEBUGTTY@ FOR DEBUGGING ONLY
 Documentation=man:sushell(8)
+Documentation=man:systemd-debug-generator(8)
 DefaultDependencies=no
 IgnoreOnIsolate=yes
 ConditionPathExists=@DEBUGTTY@