diff --git a/XCDYouTubeKit/XCDYouTubeClient.h b/XCDYouTubeKit/XCDYouTubeClient.h
index dd7ecf0f..941d6f45 100644
--- a/XCDYouTubeKit/XCDYouTubeClient.h
+++ b/XCDYouTubeKit/XCDYouTubeClient.h
@@ -125,7 +125,21 @@ NS_ASSUME_NONNULL_BEGIN
  *  @return A newly initialized`<XCDYouTubeVideoQueryOperation>` object for canceling the asynchronous query  operation. If you call the `cancel` method before the operation is finished, the completion handler will not be called.
  */
 - (XCDYouTubeVideoQueryOperation *) queryVideo:(XCDYouTubeVideo *)video cookies:(nullable NSArray <NSHTTPCookie *>*)cookies completionHandler:(void (^)(NSDictionary * __nullable streamURLs, NSError * __nullable error, NSDictionary<id, NSError *> * __nullable streamErrors))completionHandler;
-
+/**
+ *  Starts an asynchronous operation for the specified `XCDYouTubeVide` object`,  stream URLs to query and cookies, then calls a handler upon completion.
+ *
+ *  @param video The `<XCDYouTubeVideo>` object that this operation will query. Passing a `nil` video will throw an `NSInvalidArgumentException` exception.
+ *  @param streamURLsToQuery The specific stream URLs to query, can be nil. These URLs and keys must be contained in the `streamURLs` property of the `video` object, if none of the values in `streamURLsToQuery` match then all of the `streamURLs`  will be queried.
+ *  @param options  Options that are reserved for future use.
+ *  @param cookies  An array of `NSHTTPCookie` objects, can be nil. These cookies can be used for certain videos that require a login.
+ *  @param completionHandler A block to execute when the client finishes the operation. The completion handler is executed on the main thread. If the completion handler is nil, this method throws an exception.
+ *  @discussion If the query operation completes successfully (i.e. at least one URL stream is reachable), the `streamURLs` parameter of the completion handler block contains a `NSDictionary` object, and the error parameter is nil. If the operation fails, the `streamURLs` parameter is nil and the error parameter contains information about the failure. The error's domain is always `XCDYouTubeVideoErrorDomain`. The `streamErrors` does not indicate that the operation failed but can contain detailed information on why a specific stream failed.In addition, this parameter is dictionary of `NSError` objects. The keys are the YouTube [itag](https://en.wikipedia.org/wiki/YouTube#Quality_and_formats) values as `NSNumber` objects. In some cases the errors within this dictionary may contain `NSError` objects with the code `NSURLErrorNetworkConnectionLost`—this may indicate that the file stored on YouTube's server is incomplete—furthermore, the error will make this suggestion via the`NSLocalizedRecoverySuggestionErrorKey` key of the error's `userInfo`.
+ *
+ *  @see XCDYouTubeVideoQueryOperation
+ *
+ *
+ *  @return A newly initialized`<XCDYouTubeVideoQueryOperation>` object for canceling the asynchronous query  operation. If you call the `cancel` method before the operation is finished, the completion handler will not be called.
+ */
 - (XCDYouTubeVideoQueryOperation *) queryVideo:(XCDYouTubeVideo *)video streamURLsToQuery:(NSDictionary<id, NSURL *> * __nullable)streamURLsToQuery options:(NSDictionary * __nullable)options cookies:(nullable NSArray <NSHTTPCookie *>*)cookies completionHandler:(void (^)(NSDictionary *__nullable streamURLs, NSError * __nullable error, NSDictionary<id, NSError *> *__nullable streamErrors))completionHandler;
 
 
diff --git a/XCDYouTubeKit/XCDYouTubeVideoQueryOperation.h b/XCDYouTubeKit/XCDYouTubeVideoQueryOperation.h
index c81dade2..71308a0a 100644
--- a/XCDYouTubeKit/XCDYouTubeVideoQueryOperation.h
+++ b/XCDYouTubeKit/XCDYouTubeVideoQueryOperation.h
@@ -28,6 +28,11 @@ NS_ASSUME_NONNULL_BEGIN
 /// @param cookies  An array of `NSHTTPCookie` objects, can be nil. These cookies can be used for certain videos that require a login.
 - (instancetype) initWithVideo:(XCDYouTubeVideo *)video cookies:(nullable NSArray<NSHTTPCookie *> *)cookies;
 
+/// Initializes a video  query operation with the specified video,  stream URLs to query and cookies.
+/// @param video The `<XCDYouTubeVideo>` object that this operation will query. Passing a `nil` video will throw an `NSInvalidArgumentException` exception.
+/// @param streamURLsToQuery The specific stream URLs to query, can be nil. These URLs and keys must be contained in the `streamURLs` property of the `video` object, if none of the values in `streamURLsToQuery` match then all of the `streamURLs`  will be queried.
+/// @param options  Options that are reserved for future use.
+/// @param cookies  An array of `NSHTTPCookie` objects, can be nil. These cookies can be used for certain videos that require a login.
 - (instancetype) initWithVideo:(XCDYouTubeVideo *)video streamURLsToQuery:(nullable NSDictionary<id, NSURL *>*)streamURLsToQuery options:(nullable NSDictionary *)options cookies:(nullable NSArray<NSHTTPCookie *> *)cookies NS_DESIGNATED_INITIALIZER;
 
 /// The `video` object that the operation initialized initialized with.