diff --git a/gulp-uglify/gulp-uglify.d.ts b/gulp-uglify/gulp-uglify.d.ts
index 28ad91b93..840b5110b 100644
--- a/gulp-uglify/gulp-uglify.d.ts
+++ b/gulp-uglify/gulp-uglify.d.ts
@@ -30,7 +30,7 @@ declare module "gulp-uglify" {
          * some - Preserve comments that start with a bang (!) or include a Closure Compiler directive (@preserve, @license, @cc_on)
          * function - Specify your own comment preservation function. You will be passed the current node and the current comment and are expected to return either true or false.
          */
-        preserverComments?: string|((node, comment) => boolean);
+        preserverComments?: string|((node: any, comment: ITokenizer) => boolean);
     }
 
     interface IOutputOptions {
@@ -123,6 +123,53 @@ declare module "gulp-uglify" {
          */
         orig? :Object|JSON;
     }
+    
+    interface ITokenizer {
+        /**
+         * The type of this token.
+         * Can be "num", "string", "regexp", "operator", "punc", "atom", "name", "keyword", "comment1" or "comment2".
+         * "comment1" and "comment2" are for single-line, respectively multi-line comments.
+         */
+        type: string;
+        
+        /**
+         * The name of the file where this token originated from. Useful when compressing multiple files at once to generate the proper source map.
+         */
+        file: string;
+        
+        /**
+         * The "value" of the token.
+         * That's additional information and depends on the token type: "num", "string" and "regexp" tokens you get their literal value.
+         * - For "operator" you get the operator.
+         * - For "punc" it's the punctuation sign (parens, comma, semicolon etc).
+         * - For "atom", "name" and "keyword" it's the name of the identifier
+         * - For comments it's the body of the comment (excluding the initial "//" and "/*".
+         */
+        value: string;
+        
+        /**
+         * The line number of this token in the original code.
+         * 1-based index.
+         */
+        line: number;
+        
+        /**
+         * The column number of this token in the original code.
+         * 0-based index.
+         */
+        col: number;
+        
+        /**
+         * Short for "newline before", it's a boolean that tells us whether there was a newline before this node in the original source. It helps for automatic semicolon insertion.
+         * For multi-line comments in particular this will be set to true if there either was a newline before this comment, or * * if this comment contains a newline.
+         */
+        nlb: boolean;
+        
+        /**
+         * This doesn't apply for comment tokens, but for all other token types it will be an array of comment tokens that were found before.
+         */
+        comments_before: string[];
+    }
 
     export = GulpUglify;
 }
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