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[ginac.git] / ginac / indexed.h

diff --git a/ginac/indexed.h b/ginac/indexed.h
index f4891490a09d7d8b84521e17773977025074c11b..06d36c717f5617f2d63f43a3640c33bda8370568 100644 (file)
--- a/ginac/indexed.h
+++ b/ginac/indexed.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's indexed expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany
  *
  *  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
@@ -172,7 +172,8 @@ public:
        exvector get_dummy_indices() const;
 
        /** Return a vector containing the dummy indices in the contraction with
-        *  another indexed object. */
+        *  another indexed object. This is symmetric: a.get_dummy_indices(b)
+        *  == b.get_dummy_indices(a) */
        exvector get_dummy_indices(const indexed & other) const;
 
        /** Check whether the object has an index that forms a dummy index pair