diff --git a/AUTHORS b/AUTHORS
index e660456cca..e251e09f5f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -128,6 +128,7 @@ Jingcheng Zhang <diogin@gmail.com>
 Joakim Sernbrant <serbaut@gmail.com>
 Joe Poirier <jdpoirier@gmail.com>
 John Asmuth <jasmuth@gmail.com>
+John Graham-Cumming <jgc@jgc.org> <jgrahamc@gmail.com>
 Jonathan Gold <jgold.bg@gmail.com>
 Jonathan Mark <jhmark@xenops.com>
 Jonathan Wills <runningwild@gmail.com>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index e3526cbf06..dac718c31c 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -194,6 +194,7 @@ Johan Euphrosine <proppy@google.com>
 John Asmuth <jasmuth@gmail.com>
 John Beisley <huin@google.com>
 John DeNero <denero@google.com>
+John Graham-Cumming <jgc@jgc.org> <jgrahamc@gmail.com>
 Jonathan Allie <jonallie@google.com>
 Jonathan Feinberg <feinberg@google.com>
 Jonathan Gold <jgold.bg@gmail.com>