diff --git a/src/EcsFilter.cs b/src/EcsFilter.cs
index 3f4e668..638e679 100644
--- a/src/EcsFilter.cs
+++ b/src/EcsFilter.cs
@@ -371,7 +371,7 @@ namespace DCFApixels.DragonECS
 
                 Type targetType = typeof(Activator<,>).MakeGenericType(typeof(TWorldArchetype), sortedIncType, sortedExcType);
 
-                if(targetType != thisType)
+                if (targetType != thisType)
                 {
                     instance = (EcsMask)targetType.GetField(nameof(instance), BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic).GetValue(null);
                     return;
@@ -449,6 +449,11 @@ namespace DCFApixels.DragonECS
             _entities.Remove(entityID);
         }
         #endregion
+
+        #region GetEnumerator
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public EcsGroup.Enumerator GetEnumerator() => _entities.GetEnumerator();
+        #endregion
     }
     #endregion
 }