diff --git a/Debugging-flags.md b/Debugging-flags.md
index 7942fff..126acff 100644
--- a/Debugging-flags.md
+++ b/Debugging-flags.md
@@ -3,7 +3,7 @@ Sway has some debugging options available via the `-D` command-line flag.
 - `-D damage=highlight`: paints regions that haven't been updated in yellow
 - `-D damage=rerender`: disables damage tracking by forcing the whole output to be repainted each frame
 - `-D noatomic`: disables atomic transactions
-- `-D txn_wait`: forces all atomic transactions to time out
+- `-D txn-wait`: forces all atomic transactions to time out
 - `-D txn-timings`: logs addition information about transaction timings
 - `-D txn-timeout=<ms>`: overrides the default atomic transaction timeout