diff --git a/wdmtg.c b/wdmtg.c
index 4d819c8..d958968 100644
--- a/wdmtg.c
+++ b/wdmtg.c
@@ -744,7 +744,9 @@ main(int argc, char *argv[])
 		g_build_filename(g_get_user_data_dir(), PROJECT_NAME, NULL);
 	g_mkdir_with_parents(data_path, 0755);
 
-	// Bind to a control socket, also ensuring only one instance is running
+	// Bind to a control socket, also ensuring only one instance is running.
+	// We're intentionally not using XDG_RUNTIME_DIR so that what is effectively
+	// the database lock is right next to the database.
 	gchar *socket_path = g_build_filename(data_path, "socket", NULL);
 	int socket_fd = socket_init(socket_path);
 	g_free(socket_path);