1 files changed, 1 insertions, 1 deletions

diff --git a/edit-lens/src/Control/DFST.lhs b/edit-lens/src/Control/DFST.lhs
index 476a8c4..94df533 100644
--- a/edit-lens/src/Control/DFST.lhs
+++ b/edit-lens/src/Control/DFST.lhs
@@ -61,7 +61,7 @@ toFST DFST{..} = flip execState initialFST $ forM_ (Map.toList stTransition) han
       let next
             | Just (inS', i) <- chain = (st, Just (inS', succ i))
             | Just inS'      <- inS   = (st, Just (inS', 0     ))
-            | otherwise               = error "TODO: Can this happen?"
+              -- Both calls to `handleTransition'` (one in `handleTransition`, the other below) satisfy one of the above cases
       addTransition (from, inS) (next, Just outS)
       handleTransition' next Nothing oo to