diff --git a/.gitignore b/.gitignore
index ec68f8e..2fe2140 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@ dist-ssr/
 .DS_Store
 
 # Environment
+.env
 .env.local
 .env.*.local
 
diff --git a/backend/app/routers/library.py b/backend/app/routers/library.py
index 530f449..9a2b6d0 100644
--- a/backend/app/routers/library.py
+++ b/backend/app/routers/library.py
@@ -18,6 +18,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.database import get_db
 from app.models import Photo
+from app.models.folders import SourceRoot
 from app.models.user import User
 from app.dependencies import get_current_user
 
@@ -105,6 +106,13 @@ async def get_library_stats(
 
     size = (await db.execute(select(func.sum(Photo.file_size)).where(owner))).scalar() or 0
 
+    # Source root directories (active ones only).
+    roots = (
+        await db.execute(
+            select(SourceRoot.path).where(SourceRoot.is_active.is_(True)).order_by(SourceRoot.path)
+        )
+    ).scalars().all()
+
     return {
         "all_photos": all_photos_count,
         "rated": rated_count,
@@ -116,6 +124,7 @@ async def get_library_stats(
         "total_videos": video_count,
         "total_size": size,
         "total_size_gb": round(size / (1024**3), 2) if size else 0,
+        "source_dirs": roots,
     }
 
 @router.post("/scan")
diff --git a/docker-compose.yml b/docker-compose.yml
index dad11c5..816c580 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -48,7 +48,7 @@ services:
       - REDIS_URL=redis://redis:6379
       - CELERY_BROKER_URL=redis://redis:6379
       - CELERY_RESULT_BACKEND=redis://redis:6379
-      - PHOTO_DIRS=${PHOTO_DIRS:-/photos}
+      - PHOTO_DIRS=/photos
       - ALLOWED_ORIGINS=${ALLOWED_ORIGINS:-*}
       - SECRET_KEY=${SECRET_KEY:-mulita-dev-secret-change-me}
       - ACCESS_TOKEN_EXPIRE_MINUTES=${ACCESS_TOKEN_EXPIRE_MINUTES:-60}
@@ -104,7 +104,7 @@ services:
       - REDIS_URL=redis://redis:6379
       - CELERY_BROKER_URL=redis://redis:6379
       - CELERY_RESULT_BACKEND=redis://redis:6379
-      - PHOTO_DIRS=${PHOTO_DIRS:-/photos}
+      - PHOTO_DIRS=/photos
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
       # NullPool — see app/database.py for rationale.
@@ -138,7 +138,7 @@ services:
       - REDIS_URL=redis://redis:6379
       - CELERY_BROKER_URL=redis://redis:6379
       - CELERY_RESULT_BACKEND=redis://redis:6379
-      - PHOTO_DIRS=${PHOTO_DIRS:-/photos}
+      - PHOTO_DIRS=/photos
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
       - MULITA_CELERY_WORKER=1
@@ -170,7 +170,7 @@ services:
       - REDIS_URL=redis://redis:6379
       - CELERY_BROKER_URL=redis://redis:6379
       - CELERY_RESULT_BACKEND=redis://redis:6379
-      - PHOTO_DIRS=${PHOTO_DIRS:-/photos}
+      - PHOTO_DIRS=/photos
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
       - MULITA_CELERY_WORKER=1
diff --git a/frontend/src/components/dialogs/SettingsDialog.tsx b/frontend/src/components/dialogs/SettingsDialog.tsx
index 0f2bd23..2c8f92d 100644
--- a/frontend/src/components/dialogs/SettingsDialog.tsx
+++ b/frontend/src/components/dialogs/SettingsDialog.tsx
@@ -258,6 +258,17 @@ export function SettingsPage() {
                 />
               </div>
 
+              {(libStats?.source_dirs?.length ?? 0) > 0 && (
+                <div className="mt-3 text-xs text-text-muted">
+                  <span className="font-medium text-text">Source folders</span>
+                  <div className="mt-1 space-y-0.5">
+                    {libStats!.source_dirs.map((dir: string) => (
+                      <div key={dir} className="truncate font-mono" title={dir}>{dir}</div>
+                    ))}
+                  </div>
+                </div>
+              )}
+
               {/* Inline scan progress. Rendered as a full-width sub-card
                   when a scan is active so the user sees the same info
                   they'd get from the floating widget without leaving
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index 8ac7c19..2e62624 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -625,6 +625,7 @@ export interface LibraryStats {
   total_videos: number
   total_size: number
   total_size_gb: number
+  source_dirs: string[]
 }
 
 // Heaps API