diff --git a/src/3.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs b/src/3.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
index 61c4294..cbf94ff 100644
--- a/src/3.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
+++ b/src/3.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
@@ -34,7 +34,19 @@ public SystemTextJsonMergePatchInputFormatter(
 		}
 
 		private static bool ContainerIsIEnumerable(InputFormatterContext context)
-			=> context.ModelType.IsGenericType && (context.ModelType.GetGenericTypeDefinition() == typeof(IEnumerable<>));
+			=> GetEnumerableElementType(context.ModelType) != null;
+		private static Type GetEnumerableElementType(Type type)
+		{
+			if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
+				return type.GetGenericArguments()[0];
+			return null;
+		}
+		private static Type GetMergePatchDocumentModelType(Type type)
+		{
+			if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(JsonMergePatchDocument<>))
+				return type.GetGenericArguments()[0];
+			return null;
+		}
 
 		private IInternalJsonMergePatchDocument CreatePatchDocument(Type jsonMergePatchType, Type modelType, JsonElement jsonElement)
 		{
@@ -67,6 +79,16 @@ private object ConvertToPatch(object o, IList container, Type jsonMergePatchType
 			}
 		}
 
+		public override IReadOnlyList<string> GetSupportedContentTypes(string contentType, Type objectType)
+		{
+			if (GetMergePatchDocumentModelType(objectType) != null ||
+				(GetEnumerableElementType(objectType) is Type elementType && GetMergePatchDocumentModelType(elementType) != null))
+			{
+				return base.GetSupportedContentTypes(contentType, objectType);
+			}
+			return Array.Empty<string>();
+		}
+
 		public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
 		{
 			var patchContext = new InputFormatterContext(
diff --git a/src/6.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs b/src/6.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
index 61c4294..cbf94ff 100644
--- a/src/6.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
+++ b/src/6.0-JsonMergePatch.SystemText/SystemTextJsonMergePatchInputFormatter.cs
@@ -34,7 +34,19 @@ public SystemTextJsonMergePatchInputFormatter(
 		}
 
 		private static bool ContainerIsIEnumerable(InputFormatterContext context)
-			=> context.ModelType.IsGenericType && (context.ModelType.GetGenericTypeDefinition() == typeof(IEnumerable<>));
+			=> GetEnumerableElementType(context.ModelType) != null;
+		private static Type GetEnumerableElementType(Type type)
+		{
+			if (type.IsGenericType && (type.GetGenericTypeDefinition() == typeof(IEnumerable<>)))
+				return type.GetGenericArguments()[0];
+			return null;
+		}
+		private static Type GetMergePatchDocumentModelType(Type type)
+		{
+			if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(JsonMergePatchDocument<>))
+				return type.GetGenericArguments()[0];
+			return null;
+		}
 
 		private IInternalJsonMergePatchDocument CreatePatchDocument(Type jsonMergePatchType, Type modelType, JsonElement jsonElement)
 		{
@@ -67,6 +79,16 @@ private object ConvertToPatch(object o, IList container, Type jsonMergePatchType
 			}
 		}
 
+		public override IReadOnlyList<string> GetSupportedContentTypes(string contentType, Type objectType)
+		{
+			if (GetMergePatchDocumentModelType(objectType) != null ||
+				(GetEnumerableElementType(objectType) is Type elementType && GetMergePatchDocumentModelType(elementType) != null))
+			{
+				return base.GetSupportedContentTypes(contentType, objectType);
+			}
+			return Array.Empty<string>();
+		}
+
 		public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context)
 		{
 			var patchContext = new InputFormatterContext(