From 378d433c56bc1d138734e9c9169257cef15e4095 Mon Sep 17 00:00:00 2001
From: RevathiJambunathan <revanathan@gmail.com>
Date: Tue, 19 Mar 2024 13:39:29 -0700
Subject: [PATCH] adding comment

---
 Source/Utils/WarpXUtil.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Source/Utils/WarpXUtil.cpp b/Source/Utils/WarpXUtil.cpp
index bfb0a569ec8..7cd6c9b6f33 100644
--- a/Source/Utils/WarpXUtil.cpp
+++ b/Source/Utils/WarpXUtil.cpp
@@ -415,13 +415,14 @@ void ReadBCParams ()
         ablastr::warn_manager::WMRecordWarning("Input", warnMsg);
     }
 
-    // particle boundary may not be explicitly specified for some applications
     const ParmParse pp_particles("particles");
     std::vector<std::string> species_names;
     pp_particles.queryarr("species_names",species_names);
     const ParmParse pp_boundary("boundary");
     pp_boundary.queryarr("field_lo", field_BC_lo, 0, AMREX_SPACEDIM);
     pp_boundary.queryarr("field_hi", field_BC_hi, 0, AMREX_SPACEDIM);
+
+    // If number of species is finite, then get particle boundary condition, which must be specified
     if (species_names.size() > 0) {
         pp_boundary.getarr("particle_lo", particle_BC_lo, 0, AMREX_SPACEDIM);
         pp_boundary.getarr("particle_hi", particle_BC_hi, 0, AMREX_SPACEDIM);