diff --git a/connect4/types.go b/connect4/types.go
index 0aa56b7..078947c 100644
--- a/connect4/types.go
+++ b/connect4/types.go
@@ -6,10 +6,13 @@ import (
 	"github.com/ryanhamamura/games/player"
 )
 
-// NATS subject helpers.
+// SubjectPrefix is the NATS subject namespace for connect4 games.
 const SubjectPrefix = "connect4"
 
+// GameSubject returns the NATS subject for game state updates.
 func GameSubject(gameID string) string { return SubjectPrefix + "." + gameID }
+
+// ChatSubject returns the NATS subject for chat messages.
 func ChatSubject(gameID string) string { return SubjectPrefix + ".chat." + gameID }
 
 type Player struct {
diff --git a/snake/types.go b/snake/types.go
index d1284c1..d94b5d2 100644
--- a/snake/types.go
+++ b/snake/types.go
@@ -7,10 +7,13 @@ import (
 	"github.com/ryanhamamura/games/player"
 )
 
-// NATS subject helpers.
+// SubjectPrefix is the NATS subject namespace for snake games.
 const SubjectPrefix = "snake"
 
+// GameSubject returns the NATS subject for game state updates.
 func GameSubject(gameID string) string { return SubjectPrefix + "." + gameID }
+
+// ChatSubject returns the NATS subject for chat messages.
 func ChatSubject(gameID string) string { return SubjectPrefix + ".chat." + gameID }
 
 type Direction int