From 4f31c3ce017db2b4f69949a81efd56fee60ee32d Mon Sep 17 00:00:00 2001
From: Joy Bhalla <joybhalla9@gmail.com>
Date: Fri, 7 Feb 2020 02:51:33 +0530
Subject: [PATCH] Document a backward incompatibility that may affect custom
 schedulers (#4274)

---
 docs/news.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/news.rst b/docs/news.rst
index 6d0d4b4ee..e4b985c77 100644
--- a/docs/news.rst
+++ b/docs/news.rst
@@ -288,6 +288,13 @@ Backward-incompatible changes
     :class:`~scrapy.http.Request` objects instead of arbitrary Python data
     structures.
 
+*   An additional ``crawler`` parameter has been added to the ``__init__`` method
+    of the :class:`scrapy.core.scheduler.Scheduler` class. 
+    Custom scheduler subclasses which don't accept arbitrary parameters in 
+    their ``__init__`` method might break because of this change.
+
+    For more information, refer to the documentation for the :setting:`SCHEDULER` setting.
+
 See also :ref:`1.7-deprecation-removals` below.