diff --git a/scripts/processDiagnosticMessages.ts b/scripts/processDiagnosticMessages.ts
index b97e4a2ea54..9cfde5b2964 100644
--- a/scripts/processDiagnosticMessages.ts
+++ b/scripts/processDiagnosticMessages.ts
@@ -54,6 +54,7 @@ function buildInfoFileOutput(messageTable: InputDiagnosticMessageTable, nameMap:
     var result =
         '// <auto-generated />\r\n' +
         '/// <reference path="types.ts" />\r\n' +
+        '/* @internal */\r\n' +
         'module ts {\r\n' +
         '    export var Diagnostics = {\r\n';
     var names = Utilities.getObjectKeys(messageTable);
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index ea40d118382..063a0d50ef5 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -2043,19 +2043,19 @@
     },
     "'import ... =' can only be used in a .ts file.": {
         "category": "Error",
-        "code":  8002
+        "code": 8002
     },
     "'export=' can only be used in a .ts file.": {
         "category": "Error",
-        "code":  8003
+        "code": 8003
     },
     "'type parameter declarations' can only be used in a .ts file.": {
         "category": "Error",
-        "code":  8004
+        "code": 8004
     },
     "'implements clauses' can only be used in a .ts file.": {
         "category": "Error",
-        "code":  8005
+        "code": 8005
     },
     "'interface declarations' can only be used in a .ts file.": {
         "category": "Error",