diff --git a/rangeset.py b/rangeset.py
index dd5952f1..7cd674ad 100755
--- a/rangeset.py
+++ b/rangeset.py
@@ -18,6 +18,7 @@ class RangeSet:
 				n = int(part)
 				result.append(range(n, n+1))
 		return result
+	# TODO: iteration. Will require deduplication.
 	# TODO: simplification of inner ranges
 	# TODO: Set operations: union, intersection, difference?
 	# TODO: Comparison to classic range objects (only to check that it represents the same numbers)