diff --git a/README.md b/README.md
index d693cf4..28bf245 100644
--- a/README.md
+++ b/README.md
@@ -336,7 +336,7 @@ Games List
 | `unturned` | unturned | [Valve Protocol](#valve)
 | `urbanterror` | Urban Terror
 | `v8supercar` | V8 Supercar Challenge
-| `valheim`  | Valheim (2021) | [Valve Protocol](#valve)
+| `valheim`  | Valheim (2021) | [Notes](#valheim), [Valve Protocol](#valve)
 | `ventrilo` | Ventrilo
 | `vcmp`     | Vice City Multiplayer
 | `vietcong` | Vietcong
@@ -454,6 +454,9 @@ For teamspeak 3 queries to work correctly, the following permissions must be ava
 Requires tshock server mod, and a REST user token, which can be passed to GameDig with the
 additional option: `token`
 
+### Valheim
+Valheim servers will only respond to queries if they are started in public mode (`-public 1`).
+
 ### <a name="valve"></a>Valve Protocol
 For many valve games, additional 'rules' may be fetched into the unstable `raw` field by passing the additional
 option: `requestRules: true`. Beware that this may increase query time.
diff --git a/games.txt b/games.txt
index 2978c46..4acb7ea 100644
--- a/games.txt
+++ b/games.txt
@@ -279,7 +279,7 @@ ut3|Unreal Tournament 3|ut3|port=7777,port_query_offset=-1277
 
 urbanterror|Urban Terror|quake3|port_query=27960
 v8supercar|V8 Supercar Challenge|gamespy1|port_query=16700
-valheim|Valheim (2021)|valve|port=2456,port_query_offset=1
+valheim|Valheim (2021)|valve|port=2456,port_query_offset=1|doc_notes=valheim
 vcmp|Vice City Multiplayer|vcmp|port=8192
 ventrilo|Ventrilo|ventrilo|port=3784
 vietcong|Vietcong|gamespy1|port=5425,port_query=15425