diff --git a/doc/user_guide/en/introduction.adoc b/doc/user_guide/en/introduction.adoc
index 25508b29f..73d08919c 100644
--- a/doc/user_guide/en/introduction.adoc
+++ b/doc/user_guide/en/introduction.adoc
@@ -4,7 +4,11 @@ _WSJT-X_ is a computer program designed to facilitate basic amateur
 radio communication using very weak signals. The first four letters in
 the program name stand for "`**W**eak **S**ignal communication by
 K1**JT**,`" while the suffix "`-X`" indicates that _WSJT-X_ started as
-an extended and experimental branch of the program _WSJT_.
+an e**Xt**ended (and originally e**X**perimental) branch of the
+program _WSJT_.
+
+Bill Somerville, G4WJS, and Steve Franke, K9AN, have been major
+contibutors to program development since 2013 and 2015, respectively.
 
 _WSJT-X_ Version {VERSION_MAJOR}.{VERSION_MINOR} offers ten different
 protocols or modes: *FT4*, *FT8*, *JT4*, *JT9*, *JT65*, *QRA64*,
diff --git a/revision_utils.cpp b/revision_utils.cpp
index 8842e3b4c..8108b202c 100644
--- a/revision_utils.cpp
+++ b/revision_utils.cpp
@@ -84,5 +84,5 @@ QString version (bool include_patch)
 QString program_title (QString const& revision)
 {
   QString id {QCoreApplication::applicationName () + "   v" + QCoreApplication::applicationVersion ()};
-  return id + " " + revision + "  by K1JT";
+  return id + " " + revision + "  by K1JT, G4WJS, and K9AN";
 }
diff --git a/widgets/about.cpp b/widgets/about.cpp
index 7aec53c7b..b1af01807 100644
--- a/widgets/about.cpp
+++ b/widgets/about.cpp
@@ -18,13 +18,14 @@ CAboutDlg::CAboutDlg(QWidget *parent) :
                              + " " + revision ()}.simplified () + "</h2><br />"
                          "WSJT-X implements a number of digital modes designed for <br />"
                          "weak-signal Amateur Radio communication.  <br /><br />"
-                         "&copy; 2001-2019 by Joe Taylor, K1JT, with grateful <br />"
-                         "acknowledgment for contributions from AC6SL, AE4JY, <br />"
-                         "DJ0OT, G3WDG, G4KLA, G4WJS, IV3NWV, IW3RAB, K3WYC, K9AN, <br />"
-                         "KA6MAL, KA9Q, KB1ZMX, KD6EKQ, KI7MT, KK1D, ND0B, PY2SDR, <br />"
-                         "VE1SKY, VK3ACF, VK4BDJ, VK7MO, W4TI, W4TV, and W9MDB.<br /><br />"
+                         "&copy; 2001-2020 by Joe Taylor, K1JT, Bill Somerville, G4WJS, <br />"
+                         "and Steve Franke, K9AN.  <br /><br />"
+                         "We gratefully acknowledge contributions from AC6SL, AE4JY, DJ0OT, <br />"
+                         "G3WDG, G4KLA, IV3NWV, IW3RAB, K3WYC, KA6MAL, KA9Q, KB1ZMX,<br />"
+                         "KD6EKQ, KI7MT, KK1D, ND0B, PY2SDR, VE1SKY, VK3ACF, VK4BDJ,<br />"
+                         "VK7MO, W4TI, W4TV, and W9MDB.<br /><br />"
                          "WSJT-X is licensed under the terms of Version 3 <br />"
-                         "of the GNU General Public License (GPL) <br />"
+                         "of the GNU General Public License (GPL) <br /><br />"
                          "<a href=" WSJTX_STRINGIZE (PROJECT_HOMEPAGE) ">"
                          "<img src=\":/icon_128x128.png\" /></a>"
                          "<a href=\"https://www.gnu.org/licenses/gpl-3.0.txt\">"