diff --git a/Debugging-flags.md b/Debugging-flags.md
index 126acff..a408d4f 100644
--- a/Debugging-flags.md
+++ b/Debugging-flags.md
@@ -6,5 +6,6 @@ Sway has some debugging options available via the `-D` command-line flag.
 - `-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
+- `-D noscanout`: disables direct scan-out
 
 Also see `enable_debug_flag()`.
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