From 536e7a969aac5bda077287172b2fc22d223af19d Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Mon, 9 Mar 2020 09:17:49 -0400
Subject: [PATCH] silence compiler warning and provide extra comment about
 optimization

---
 src/min_cg.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/min_cg.cpp b/src/min_cg.cpp
index c164fb55d6..46da4bfa5b 100644
--- a/src/min_cg.cpp
+++ b/src/min_cg.cpp
@@ -109,10 +109,11 @@ int MinCG::iterate(int maxiter)
         dotall[1] += fextra[i]*gextra[i];
       }
 
+    fdotf = 0.0;
     if (update->ftol > 0.0) {
       if (normstyle == MAX) fdotf = fnorm_max();        // max force norm
       else if (normstyle == INF) fdotf = fnorm_inf();   // infinite force norm
-      else if (normstyle == TWO) fdotf = dotall[0];     // Euclidean force 2-norm
+      else if (normstyle == TWO) fdotf = dotall[0];     // same as fnorm_sqr(), Euclidean force 2-norm
       else error->all(FLERR,"Illegal min_modify command");
       if (fdotf < update->ftol*update->ftol) return FTOL;
     }