diff --git a/todo.txt b/todo.txt
index 83c079b47..dc9c24f85 100644
--- a/todo.txt
+++ b/todo.txt
@@ -254,6 +254,7 @@ X fight with serial library on windows all afternoon
 X finish and test on macosx as well
 X remove chatter in PdeSketchbook re: filenamefilter
 X   COM1 19200 for phone
+X add "available" function to PSerial
 
 _ error in System.err stream coming from running external
 _   dies after a while or goes weird