From 93169c34f3cb0d9caca32587e8dcc32f701c8838 Mon Sep 17 00:00:00 2001
From: Mikolaj-A-Kowalski
 <32641577+Mikolaj-A-Kowalski@users.noreply.github.com>
Date: Tue, 21 Nov 2023 12:05:24 +0100
Subject: [PATCH] Update docs/User Manual.rst

Co-authored-by: valeriaRaffuzzi <108435337+valeriaRaffuzzi@users.noreply.github.com>
---
 docs/User Manual.rst | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/docs/User Manual.rst b/docs/User Manual.rst
index a517dd452..ef2841d4d 100644
--- a/docs/User Manual.rst	
+++ b/docs/User Manual.rst	
@@ -203,9 +203,10 @@ Hence, an input would look like: ::
 fissionSource
 #############
 
-A source intended to be used in eigenvalue calculations. It is a type of volumetric source, which
-uniformly distributes fission sites in the geometry. The energy spectrum of the fission neutrons
-is based on a fixed incident energy provided by the user. The properties of a fission source are:
+A source intended to initialise eigenvalue calculations. If it is not defined in the input file, it is
+used with the default settings. It is a type of volumetric source, which uniformly distributes fission
+sites in the geometry. The energy spectrum of the fission neutrons is based on a fixed incident
+energy provided by the user. The properties of a fission source are:
 
 * data (*optional*, default='ce'): data type for source particles. Can be ``ce``
   or ``mg``.