diff --git a/bin/evening_detective_server b/bin/evening_detective_server
index af9943f..2846676 100755
Binary files a/bin/evening_detective_server and b/bin/evening_detective_server differ
diff --git a/docs/PARTICIPATION.md b/docs/PARTICIPATION.md
index 132e7cb..f5305fc 100644
--- a/docs/PARTICIPATION.md
+++ b/docs/PARTICIPATION.md
@@ -8,7 +8,7 @@
 ## Правила
 
 - `pending` — ожидает ответа; команда сохраняет право участвовать.
-- `confirmed` — подтверждено капитаном или автоматически при регистрации менее чем за сутки.
+- `confirmed` — подтверждено капитаном, первым ходом команды (`first_action`) или автоматически при регистрации менее чем за сутки.
 - `cancelled` — отменено; команда остаётся в истории организатора, но исключается из игры,
   ответов организатору, результатов, карты и PDF с QR-кодами.
 - Ровно за 24 часа автоматического подтверждения нет.
diff --git a/internal/repos/teams_repo/participation.go b/internal/repos/teams_repo/participation.go
index fe3fe1b..6d78a1b 100644
--- a/internal/repos/teams_repo/participation.go
+++ b/internal/repos/teams_repo/participation.go
@@ -117,6 +117,13 @@ func (r *TeamsRepo) SetParticipationToken(ctx context.Context, id int, token str
 	return err
 }
 
+func (r *TeamsRepo) ConfirmParticipationByFirstAction(ctx context.Context, teamID int) error {
+	_, err := r.pool.Exec(ctx, `UPDATE teams SET participation_status='confirmed',
+ participation_source='first_action', participation_answered_at=NOW()
+ WHERE id=$1 AND participation_status='pending'`, teamID)
+	return err
+}
+
 func (r *TeamsRepo) FinishParticipationEmail(ctx context.Context, id, attempt int, sendErr error) error {
 	message := ""
 	if sendErr != nil {
diff --git a/internal/services/game_service/participation_test.go b/internal/services/game_service/participation_test.go
index 9ee4106..972344b 100644
--- a/internal/services/game_service/participation_test.go
+++ b/internal/services/game_service/participation_test.go
@@ -106,6 +106,10 @@ func TestParticipationPostgres(t *testing.T) {
 	state(3, "pending")
 	state(4, "confirmed")
 	state(5, "pending")
+	if err := repo.ConfirmParticipationByFirstAction(ctx, 5); err != nil {
+		t.Fatal(err)
+	}
+	state(5, "confirmed")
 	// Independent workers must claim each due team just once.
 	var wg sync.WaitGroup
 	ids := make(chan int, 8)
diff --git a/internal/services/game_service/service.go b/internal/services/game_service/service.go
index 4563054..5e1d476 100644
--- a/internal/services/game_service/service.go
+++ b/internal/services/game_service/service.go
@@ -299,6 +299,11 @@ func (s *GameService) AddTeamAction(ctx context.Context, teamId int, password st
 	if err != nil {
 		return err
 	}
+	if team.ParticipationStatus == "pending" {
+		if err := s.teamsRepo.ConfirmParticipationByFirstAction(ctx, teamId); err != nil {
+			return err
+		}
+	}
 
 	game, err := s.gamesRepo.GetGameByID(ctx, team.GameId)
 	if err != nil {