diff --git a/docs/validation.md b/docs/validation.md
index 4232f7b..cdb46ac 100644
--- a/docs/validation.md
+++ b/docs/validation.md
@@ -244,8 +244,14 @@ running; simultaneous games are selected by PID order and the next still-live
 game is detected after the current session ends. Linux Steam names come from
 library manifests, with `App <id>` as the fallback. Windows requires a manifest
 installation path to identify candidate processes and fails honestly if none
-can be found. Real Steam/Proton lifecycle validation, X11 desktop session
-integration and Windows runtime validation remain follow-ups. Audio-source
+can be found. X11 desktop session integration and Windows runtime validation
+remain follow-ups.
+
+Real Steam validated 2026-10-08 on CachyOS/Hyprland (native Steam): Escape
+from Duckov (AppId 3167020, Proton Experimental under SteamLinuxRuntime_4)
+runs under `reaper SteamLaunch AppId=3167020 -- …/_v2-entry-point … proton
+waitforexitandrun …/Duckov.exe`. Clipbin detected it, named it from its
+manifest ("Escape from Duckov") and recorded the session. Audio-source
 failure detection remains limited as described above.
 
 GPUI 0.2.2 ends its Linux event loop when the last window is removed, even