diff --git a/galomatch/io/readsim.py b/galomatch/io/readsim.py
index 49fd6e2..d2287c1 100644
--- a/galomatch/io/readsim.py
+++ b/galomatch/io/readsim.py
@@ -1,4 +1,20 @@
-# PUT HARRY HERE
+# Copyright (C) 2022 Richard Stiskalek, Harry Desmond
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 3 of the License, or (at your
+# option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
+# Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+"""Functions to read in the particle and clump files."""
+
 import numpy
 from scipy.io import FortranFile
 from os import listdir