diff --git a/OSMDatastructure/TagManager.cs b/OSMDatastructure/TagManager.cs
index 0c10132..91eb4c4 100644
--- a/OSMDatastructure/TagManager.cs
+++ b/OSMDatastructure/TagManager.cs
@@ -33,6 +33,13 @@ public class TagManager
         }
     }
 
+    public void AddTag(ulong wayId, KeyValuePair<Tag.TagType, dynamic> keyValuePair)
+    {
+        if(!wayTags.ContainsKey(wayId))
+            wayTags.Add(wayId, new HashSet<Tag>());
+        wayTags[wayId].Add(new Tag(keyValuePair.Key, keyValuePair.Value));
+    }
+
     public HashSet<Tag>? GetTagsForWayId(ulong wayId)
     {
         return wayTags.TryGetValue(wayId, out HashSet<Tag>? value) ? value : null;