diff --git a/embddr/vcd.scm b/embddr/vcd.scm
index 41d934a..30e9622 100644
--- a/embddr/vcd.scm
+++ b/embddr/vcd.scm
@@ -139,6 +139,7 @@
              ((string-ci= name "$timescale")
               (next-cmd (parse-timescale (second cmd)) scope tags+signals))
 
+             ;; TODO: Add scope type (make scope as pair '(scope-type . scope-name))
              ((string-ci= name "$scope")
               (next-cmd timescale (cons (third cmd) scope) tags+signals))