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diff --git a/BLAS/SRC/cgbmv.f b/BLAS/SRC/cgbmv.f
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@@ -122,6 +122,7 @@
* ===============
*
* 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.