diff --git a/Settings.md b/Settings.md
index 7ae3353..185283d 100644
--- a/Settings.md
+++ b/Settings.md
@@ -83,6 +83,7 @@ var server = WireMockServer.Start(new FluentMockServerSettings
             Address = "http://company.proxy"
         },
         UseDefinedRequestMatchers = false,
+        AppendGuidToSavedMappingFile = true,
         ReplaceSettings = new ProxyUrlReplaceSettings
         {
             "OldValue" = "old",
@@ -103,6 +104,7 @@ Where
 * `WebProxySettings` = Defines the WebProxySettings.
 * `AllowAutoRedirect` = Proxy requests should follow redirection (30x). Default null / false.
 * `UseDefinedRequestMatchers` = When SaveMapping is set to <c>true</c>, this setting can be used to control the behavior of the generated request matchers for the new mapping.
+* `AppendGuidToSavedMappingFile` = Append an unique GUID to the filename from the saved mapping file.
 
 #### WebProxySettings
 * `Address` = Contains the address of the proxy server.