From f37610d1f775dbfcc935b129d76c13c407b30e3b Mon Sep 17 00:00:00 2001
From: wpbonelli <wbonelli@ucar.edu>
Date: Sun, 4 Feb 2024 18:01:01 -0500
Subject: [PATCH] fix(MFSimulationList): fix comma spacing in error message
 (#2090)

---
 flopy/mf6/utils/mfsimlistfile.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flopy/mf6/utils/mfsimlistfile.py b/flopy/mf6/utils/mfsimlistfile.py
index c7270711b3..9e5c0e53e5 100644
--- a/flopy/mf6/utils/mfsimlistfile.py
+++ b/flopy/mf6/utils/mfsimlistfile.py
@@ -83,7 +83,7 @@ def get_runtime(
         if units not in UNITS:
             msg = (
                 "units input variable must be "
-                + " ,".join(UNITS)
+                + ", ".join(UNITS)
                 + f": {units} was specified."
             )
             raise ValueError(msg)