--- rpl/lapack/blas/dsbmv.f	2010/12/21 13:51:25	1.6
+++ rpl/lapack/blas/dsbmv.f	2011/07/22 07:38:01	1.7
@@ -118,8 +118,11 @@
 *           Y. INCY must not be zero.
 *           Unchanged on exit.
 *
+*  Further Details
+*  ===============
 *
 *  Level 2 Blas routine.
+*  The vector and matrix arguments are not referenced when N = 0, or M = 0
 *
 *  -- Written on 22-October-1986.
 *     Jack Dongarra, Argonne National Lab.