diff --git a/.mailmap b/.mailmap
index f9154ac..42a86fd 100644
--- a/.mailmap
+++ b/.mailmap
@@ -1,4 +1,3 @@
-Sam Hatchett <samhatchett@gmail.com>
 James Uber <jim@citilogics.com>
 Demetrios Eliades <eldemet@gmail.com>
 Hyoungmin Woo <hyoungmin.woo@gmail.com>
@@ -10,4 +9,12 @@ Elad Salomons <selad@optiwater.com> <elad.salomons@gmail.com>
 Angela Marchi <angela.marchi@adelaide.edu.au>
 Angela Marchi <angela.marchi@adelaide.edu.au> <a1219261@adelaide.edu.au>
 Bryant McDonnell <bemcdonnell@gmail.com>
-Marios Kyriakou <mariosmsk@gmail.com> 
+Marios Kyriakou <mariosmsk@gmail.com>
+Marios Kyriakou <mariosmsk@gmail.com> <mariosmsk@mariosmsk.com>
+Sam Hatchett <samhatchett@gmail.com>
+Sam Hatchett <samhatchett@gmail.com> <sam.hatchett@xyleminc.com>
+Markus Sunela <markus.sunela@fluidit.fi>
+Markus Sunela <markus.sunela@fluidit.fi> <30700548+makusuko@users.noreply.github.com>
+Lew Rossman <LRossman@cinci.rr.com>
+Lew Rossman <LRossman@cinci.rr.com> <LRossman@outlook.com>
+Michael Tryby <tryby.michael@epa.gov> michaeltryby <tryby.michael@epa.gov>
diff --git a/AUTHORS b/AUTHORS
index 0a3fafe..2a74cc9 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,8 +1,8 @@
 # Authors ordered by first contribution.
-# Generated by tools/update-authors.sh
+# (Mostly) Generated by tools/update-authors.sh
 
-Lew Rossman <LRossman@cinci.rr.com> ***
-Michael Tryby <tryby.michael@epa.gov> ***
+Lew Rossman <LRossman@cinci.rr.com>
+Michael Tryby <tryby.michael@epa.gov>
 Sam Hatchett <samhatchett@gmail.com>
 Feng Shang <fshang>
 James Uber <jim@citilogics.com>
@@ -19,7 +19,8 @@ Elad Salomons <selad@optiwater.com>
 Maurizio Cingi <mrzcng2@gmail.com>
 Bryant McDonnell <bemcdonnell@gmail.com>
 Angela Marchi <angela.marchi@adelaide.edu.au>
+Lew Rossman <LRossman@cinci.rr.com>
 Markus Sunela <markus.sunela@fluidit.fi>
-mariosmsk <mariosmsk@mariosmsk.com>
+Milad Ghiami <milad-ghiami@users.noreply.github.com>
 
-*** = works in the public domain
\ No newline at end of file
+*** some works are in the public domain, all others licensed under terms: see LICENSE
diff --git a/tools/update-authors.sh b/tools/update-authors.sh
index 7bddff2..4abe57b 100755
--- a/tools/update-authors.sh
+++ b/tools/update-authors.sh
@@ -25,8 +25,12 @@ END {
   print "# Authors ordered by first contribution.\n";
   print "# Generated by tools/update-authors.sh\n";
   print "\n", @authors;
-  print "\n*** = works in the public domain";
+  print "\n*** some works are in the public domain, all others licensed under terms: see LICENSE";
 
 }
 
 '
+
+echo "\n\nSome commits are co-authored:\n"
+
+git log | grep Co-Author