diff --git a/todo.txt b/todo.txt
index 276378a..456de6f 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,5 +1,17 @@
 ---
 
+With q returning a vector, what of union & rel.
+
+* these are currently top level macro, should they be special nested forms?
+* logically they apply to the src position in relational bindings
+   ** (c/q [a (c/union b c d)] a)
+   ** (c/q [a (c/with [b c, b d] b)] a)
+        *** is this too noisy?
+        *** could add an arity for with, makes adding opts harder? (c/rel [b c, b d] [a b] a)
+            also, what about apply cte, using column variables in the cte definitions
+
+---
+
 one pass aggregation perf
 
 group-fusion works again, but it does not perform as well as I'd like.