From 555a0319ff558123aaabb8214190c53b621ffe95 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Sat, 9 Mar 2019 11:38:49 +0100
Subject: Add a comment

---
 libcrystfel/src/rational.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libcrystfel/src/rational.c b/libcrystfel/src/rational.c
index 5f17b0ea..20a73bc8 100644
--- a/libcrystfel/src/rational.c
+++ b/libcrystfel/src/rational.c
@@ -571,6 +571,7 @@ void rtnl_mtx_mtxmult(const RationalMatrix *A, const RationalMatrix *B,
 }
 
 
+/* Calculate ans = m.vec, where 'ans' and 'vec' are column vectors */
 void rtnl_mtx_mult(const RationalMatrix *m, const Rational *vec, Rational *ans)
 {
 	int i, j;
-- 
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