diff --git a/README.md b/README.md
index 1a59c93..87a8b4c 100644
--- a/README.md
+++ b/README.md
@@ -301,7 +301,9 @@ xget(URL)
 ### <a id='headhandler'></a> HeadHandler: [`function`][function]
 
 - `props`: &lt;[object][]&gt;
+  - `chunks`: &lt;[number][]&gt; Number of chunks the resource can simultaneously provide.
   - `headers`: &lt;[IncomingHttpHeaders][incominghttpheaders]&gt; GET headers from the URL.
+  - `totalSize`: &lt;[number][]&gt; Actual size of the resource without an offset.
   - `acceptsRanges`: &lt;[boolean][]&gt; Whether or not the URL resource accepts byte ranges.
 - Returns: &lt;[number] | void&gt; An offset to begin streaming from. Analogous to the `.start` field in [XGETOptions](#xgetoptions). If void, defaults to `.start` or `0`;
 
diff --git a/typings/index.d.ts b/typings/index.d.ts
index d845718..6d99061 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -86,7 +86,14 @@ declare namespace xget {
 
   type MiddlewareStore = Map<string, any>;
 
-  type HeadHandler = (props: {headers: IncomingHttpHeaders, acceptsRanges: boolean}) => number | void;
+  interface HeaderSlice {
+    chunks: number;
+    headers: IncomingHttpHeaders;
+    totalSize: number;
+    acceptsRanges: boolean;
+  }
+
+  type HeadHandler = (props: HeaderSlice) => number | void;
   type UseMiddlewareFn = (dataSlice: ChunkLoadInstance, store: MiddlewareStore) => NodeJS.ReadWriteStream;
   type WithMiddlewareFn = (loadData: LoadDataSlice) => any;