diff --git a/Debugging-flags.md b/Debugging-flags.md
index a408d4f..b26d6b4 100644
--- a/Debugging-flags.md
+++ b/Debugging-flags.md
@@ -1,11 +1,15 @@
 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-timings`: logs addition information about transaction timings
 - `-D txn-timeout=<ms>`: overrides the default atomic transaction timeout
-- `-D noscanout`: disables direct scan-out
+- `-D legacy-wl-drm`: enables the legacy `wl_drm` protocol extension (Sway 1.10 and later)
 
-Also see `enable_debug_flag()`.
\ No newline at end of file
+Also see `enable_debug_flag()`.
+
+On Sway ≤ 1.9, the following flags are also supported:
+
+- `-D damage=highlight`: paints regions that haven't been updated in yellow (replaced by `WLR_SCENE_DEBUG_DAMAGE=highlight` on Sway 1.10)
+- `-D damage=rerender`: disables damage tracking by forcing the whole output to be repainted each frame (replaced by `WLR_SCENE_DEBUG_DAMAGE=rerender` on Sway 1.10)
+- `-D noscanout`: disables direct scan-out (replaced by `WLR_SCENE_DISABLE_DIRECT_SCANOUT=1` on Sway 1.10)
\ No newline at end of file