diff --git a/extra/gap-buffer/authors.txt b/extra/gap-buffer/authors.txt
new file mode 100644
index 0000000000..e9c193bac7
--- /dev/null
+++ b/extra/gap-buffer/authors.txt
@@ -0,0 +1 @@
+Alex Chapman
diff --git a/extra/gap-buffer/cursortree/authors.txt b/extra/gap-buffer/cursortree/authors.txt
new file mode 100644
index 0000000000..e9c193bac7
--- /dev/null
+++ b/extra/gap-buffer/cursortree/authors.txt
@@ -0,0 +1 @@
+Alex Chapman