From 78e2aac8f5e2c7bbd164a86f05dc120c31790318 Mon Sep 17 00:00:00 2001
From: "Joachim Wuttke (o)" <j.wuttke@fz-juelich.de>
Date: Mon, 8 Feb 2016 17:06:39 +0100
Subject: [PATCH] clarify relation to literature

---
 Doc/UserManual/FFCompute.tex | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Doc/UserManual/FFCompute.tex b/Doc/UserManual/FFCompute.tex
index fbe1823c8a7..9662c63b60d 100644
--- a/Doc/UserManual/FFCompute.tex
+++ b/Doc/UserManual/FFCompute.tex
@@ -120,8 +120,9 @@ to deal with the second case in~(\ref{Eexpcancel}).
 
 To derive the form factor of prisms and pyramids with polygonal bases
 we need the form factor of an arbitrary planar polygon~$\Pi$.
-The solution is known from the literature~\cite{LeMi83},
-but shall be derived here by a different method.
+The solution avalaible from the literature~\cite{LeMi83}
+contains singularities and does not provide an obvious way how handle them.
+Here, a different expression shall be derived by a different method.
 The plane of the polygon has a normal~$\n$,
 which induces a decomposition of any vector~$\x$ into normal
 and in-plane components
-- 
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