diff --git a/thunar/thunar-dialogs.c b/thunar/thunar-dialogs.c
index 941c2468b..a1c3c0edb 100644
--- a/thunar/thunar-dialogs.c
+++ b/thunar/thunar-dialogs.c
@@ -262,7 +262,9 @@ thunar_dialogs_show_about (GtkWindow   *parent,
                          "comments", comments,
                          "copyright", "Copyright \302\251 2004-2011 Benedikt Meurer\n"
                                       "Copyright \302\251 2009-2011 Jannis Pohlmann\n"
-                                      "Copyright \302\251 2009-2012 Nick Schermer",
+                                      "Copyright \302\251 2009-2012 Nick Schermer\n"
+                                      "Copyright \302\251 2017-2018 Alexander Schwinn\n"
+                                      "Copyright \302\251 2017-2018 Andre Miranda",
                          "destroy-with-parent", TRUE,
                          "documenters", documenters,
                          "license", XFCE_LICENSE_GPL,