diff --git a/GSS2.Core/Extensions/EnumerableExtensions.cs b/GSS2.Core/Extensions/EnumerableExtensions.cs
index fb72d91..79fae17 100644
--- a/GSS2.Core/Extensions/EnumerableExtensions.cs
+++ b/GSS2.Core/Extensions/EnumerableExtensions.cs
@@ -15,7 +15,7 @@ public static class EnumerableExtensions
             strs.Add($"{enumerator.Key}: {enumerator.Value}");
         return string.Join(separator, strs.Select(s => $"{new string(' ', indent)}{s}"));
     }
-    
+
     public static string ToString<TValue>(this IEnumerable<TValue> values, string separator, int indent) => (values as IEnumerable).ToString(separator, indent);
     public static string ToString(this IEnumerable values, string separator, int indent)
     {
@@ -28,5 +28,11 @@ public static class EnumerableExtensions
 
     public static bool All(this IEnumerable<bool> values) => values.All(v => v);
     public static bool Any(this IEnumerable<bool> values) => values.Any(v => v);
+
+    public static void AddRange<TValue, TKey>(this IDictionary<TValue, TKey> values, IEnumerable<KeyValuePair<TValue, TKey>> collection)
+    {
+        foreach (var kv in collection)
+            values.Add(kv);
+    }
 }