diff --git a/RouteHelper/README.md b/RouteHelper/README.md
new file mode 100644
index 00000000..01dce924
--- /dev/null
+++ b/RouteHelper/README.md
@@ -0,0 +1,29 @@
+# RouteHelper
+```cpp
+ULONG ConvertLuidToIndex(ULONG64 id);
+BOOL CreateIPv4(const char* address, const char* netmask, ULONG index);
+BOOL CreateUnicastIP(USHORT inet, const char* address, UINT8 cidr, ULONG index);
+BOOL RefreshIPTable(USHORT inet, ULONG index);
+BOOL CreateRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, ULONG metric);
+BOOL DeleteRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, ULONG metric);
+```
+
+```csharp
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern ulong ConvertLuidToIndex(ulong id);
+
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern bool CreateIPv4(string address, string netmask, ulong index);
+
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern bool CreateUnicastIP(AddressFamily inet, string address, byte cidr, ulong index);
+
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern bool RefreshIPTable(AddressFamily inet, ulong index);
+
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern bool CreateRoute(AddressFamily inet, string address, byte cidr, string gateway, ulong index, ulong metric);
+
+[DllImport("RouteHelper.bin", CallingConvention = CallingConvention.Cdecl)]
+public static extern bool CreateRoute(AddressFamily inet, string address, byte cidr, string gateway, ulong index, ulong metric);
+```
diff --git a/RouteHelper/RouteHelper.cpp b/RouteHelper/RouteHelper.cpp
index 6c2584e3..23620c01 100644
--- a/RouteHelper/RouteHelper.cpp
+++ b/RouteHelper/RouteHelper.cpp
@@ -16,7 +16,7 @@ BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserv
     return TRUE;
 }
 
-BOOL make(PMIB_IPFORWARD_ROW2 rule, USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, int metric)
+BOOL make(PMIB_IPFORWARD_ROW2 rule, USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, ULONG metric)
 {
     rule->InterfaceIndex = index;
     rule->DestinationPrefix.PrefixLength = cidr;
@@ -130,7 +130,7 @@ extern "C" {
         return (NO_ERROR == FlushIpNetTable2(inet, index)) ? TRUE : FALSE;
     }
 
-    __declspec(dllexport) BOOL __cdecl CreateRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, int metric = 1)
+    __declspec(dllexport) BOOL __cdecl CreateRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, ULONG metric = 1)
     {
         MIB_IPFORWARD_ROW2 rule;
         InitializeIpForwardEntry(&rule);
@@ -143,7 +143,7 @@ extern "C" {
         return (NO_ERROR == CreateIpForwardEntry2(&rule)) ? TRUE : FALSE;
     }
 
-    __declspec(dllexport) BOOL __cdecl DeleteRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, int metric = 1)
+    __declspec(dllexport) BOOL __cdecl DeleteRoute(USHORT inet, const char* address, UINT8 cidr, const char* gateway, ULONG index, ULONG metric = 1)
     {
         MIB_IPFORWARD_ROW2 rule;
         InitializeIpForwardEntry(&rule);