diff --git a/docs/architecture/c4-diagrams.md b/docs/architecture/c4-diagrams.md
index 4645083c..a2f6f7db 100644
--- a/docs/architecture/c4-diagrams.md
+++ b/docs/architecture/c4-diagrams.md
@@ -319,7 +319,7 @@ C4Component
         Component(dashCtrl, "DashboardController", "Spring MVC — /api/dashboard", "REST endpoints for the user dashboard: recent document resume (/resume), weekly transcription pulse stats (/pulse), and activity feed (/activity) with kind filtering and pagination.")
         Component(statsCtrl, "StatsController", "Spring MVC — /api/stats", "Returns aggregate counts (total persons, total documents) for the UI stats bar.")
         Component(statsSvc, "StatsService", "Spring Service", "Queries aggregate counts: total persons and total documents.")
-        Component(dashSvc, "DashboardService", "Spring Service", "Assembles the user dashboard: recent document resume, weekly transcription pulse stats, and activity feed with contributor avatars.")
+        Component(dashSvc, "DashboardService", "Spring Service", "Assembles the user dashboard: recent document resume (calls DocumentService + TranscriptionService), weekly transcription pulse stats, and activity feed with contributor avatars.")
 
         Component(notifCtrl, "NotificationController", "Spring MVC — /api/notifications", "REST and SSE endpoints for notification stream, history with filtering, read/unread state, and per-user preference management.")
         Component(notifSvc, "NotificationService", "Spring Service", "Creates REPLY and MENTION notifications, optionally sends email, marks as read, and pushes events to connected clients via SseEmitterRegistry.")
@@ -331,6 +331,9 @@ C4Component
         Component(exHandler, "GlobalExceptionHandler", "Spring @RestControllerAdvice", "Converts DomainException, validation errors, and generic exceptions to ErrorResponse JSON with machine-readable ErrorCode and HTTP status.")
     }
 
+    Component(documentSvc, "DocumentService", "Spring Service", "See diagram 3b. Called by DashboardService to fetch document titles and resume data.")
+    Component(transcriptionSvc, "TranscriptionService", "Spring Service", "See diagram 3b.2. Called by DashboardService to fetch transcription block progress for resume.")
+
     Rel(frontend, dashCtrl, "Dashboard requests", "HTTP / JSON")
     Rel(frontend, statsCtrl, "GET /api/stats", "HTTP / JSON")
     Rel(frontend, notifCtrl, "Notification stream and history", "HTTP / JSON / SSE")
@@ -339,6 +342,8 @@ C4Component
     Rel(statsCtrl, statsSvc, "Delegates to", "")
     Rel(statsSvc, db, "Reads aggregate counts", "JDBC")
     Rel(dashSvc, auditQuery, "Fetches activity feed and pulse stats", "")
+    Rel(dashSvc, documentSvc, "Fetches document titles and resume data", "")
+    Rel(dashSvc, transcriptionSvc, "Fetches transcription block progress for resume", "")
     Rel(notifCtrl, notifSvc, "Delegates to", "")
     Rel(notifCtrl, sseRegistry, "Registers client SSE connection", "")
     Rel(notifSvc, sseRegistry, "Broadcasts events to connected clients", "")