diff --git a/AFNetworking/AFHTTPClient.h b/AFNetworking/AFHTTPClient.h
index e5a1650..5cc6913 100644
--- a/AFNetworking/AFHTTPClient.h
+++ b/AFNetworking/AFHTTPClient.h
@@ -162,6 +162,9 @@ extern NSString * AFQueryStringFromParametersWithEncoding(NSDictionary *paramete
 ///-----------------------------------
 
 /**
+ Sets a callback to be executed when the network availability of the `baseURL` host changes.
+ 
+ @param block A block object to be executed when the network availability of the `baseURL` host changes.. This block has no return value and takes a single argument, which is `YES` if the host is available, otherwise `NO`. 
  */
 - (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))block;