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-rw-r--r--BLAS/SRC/dtrmv.f1
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diff --git a/BLAS/SRC/dtrmv.f b/BLAS/SRC/dtrmv.f
index b1ca93a4..0381e1d2 100644
--- a/BLAS/SRC/dtrmv.f
+++ b/BLAS/SRC/dtrmv.f
@@ -92,6 +92,7 @@
* ===============
*
* 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.