diff --git a/TODO b/TODO
index 754be14..7390a63 100644
--- a/TODO
+++ b/TODO
@@ -5,3 +5,13 @@
 - Leading/trailing space around LHS/RHS ignore, within strings, preserved
 - Strings interpolated based on symbols seen *so far*, line by line
 - Can be used on both hostlistfiles and command files
+
+Test Mode
+---------
+
+- Default to test mode.  Use -t to turn off and actually execute.
+
+- Shows what the program WOULD do after all includes and 
+  variable substitutions are resolved.  Ditto the list of
+  hosts involved.
+