From 5320461e999d789f1ad8cd3b6d96bff66152286d Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Wed, 22 Sep 2021 14:24:54 -0700
Subject: [PATCH] Docs for postprocess_at_target expression types
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Co-authored-by: Andreas Klöckner <inform@tiker.net>
---
 sumpy/kernel.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sumpy/kernel.py b/sumpy/kernel.py
index 03936891..efb4b093 100644
--- a/sumpy/kernel.py
+++ b/sumpy/kernel.py
@@ -238,6 +238,9 @@ class Kernel:
 
         The typical use of this function is to apply target-variable
         derivatives to the kernel.
+        
+        :arg expr: may be a :class:`sympy.Expr` or a
+            :class:`sumpy.tools.DifferentiatedExprDerivativeTaker`.
         """
         return expr
 
-- 
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