diff --git a/doc/master/get_master_uid b/doc/master/get_master_uid
new file mode 100644
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+++ b/doc/master/get_master_uid
@@ -0,0 +1,12 @@
+SYNOPSIS
+	string get_master_uid(void)
+
+DESCRIPTION
+	Return the string to be used as root-uid.
+	Under !native, the function is expendable.
+
+HISTORY
+	Introduced in 3.2.1@40 replacing get_root_uid().
+
+SEE ALSO
+	get_bb_uid(M), get_master_uid(M), uids(C), creator_file(M), creator(E)