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diff --git a/octave_packages/quaternion-2.0.0/@quaternion/minus.m b/octave_packages/quaternion-2.0.0/@quaternion/minus.m
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+## Copyright (C) 2010   Lukas F. Reichlin
+##
+## 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## Subtraction of two quaternions.  Used by Octave for "q1 - q2".
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: May 2010
+## Version: 0.1
+
+function a = minus (a, b)
+
+  if (! isa (a, "quaternion"))
+    a = quaternion (a);
+  endif
+
+  if (! isa (b, "quaternion"))
+    b = quaternion (b);
+  endif
+
+  a.w = a.w - b.w;
+  a.x = a.x - b.x;
+  a.y = a.y - b.y;
+  a.z = a.z - b.z;
+
+endfunction