diff --git a/extra/file-picker/authors.txt b/extra/file-picker/authors.txt
new file mode 100644
index 0000000000..e091bb8164
--- /dev/null
+++ b/extra/file-picker/authors.txt
@@ -0,0 +1 @@
+John Benediktsson
diff --git a/extra/file-picker/file-picker.factor b/extra/file-picker/file-picker.factor
index d5bc6c404f..3713354426 100644
--- a/extra/file-picker/file-picker.factor
+++ b/extra/file-picker/file-picker.factor
@@ -1,3 +1,5 @@
+! Copyright (C) 2014 John Benediktsson.
+! See http://factorcode.org/license.txt for BSD license.
 USING: accessors sequences system vocabs ;
 IN: file-picker
 
diff --git a/extra/file-picker/linux/authors.txt b/extra/file-picker/linux/authors.txt
new file mode 100644
index 0000000000..e091bb8164
--- /dev/null
+++ b/extra/file-picker/linux/authors.txt
@@ -0,0 +1 @@
+John Benediktsson
diff --git a/extra/file-picker/linux/linux.factor b/extra/file-picker/linux/linux.factor
index d33b61446b..9e7ff65ec4 100644
--- a/extra/file-picker/linux/linux.factor
+++ b/extra/file-picker/linux/linux.factor
@@ -1,3 +1,5 @@
+! Copyright (C) 2014, 2015 John Benediktsson.
+! See http://factorcode.org/license.txt for BSD license.
 USING: alien.c-types alien.data alien.strings alien.syntax
 destructors file-picker gobject-introspection.standard-types
 gtk.ffi io.encodings.string io.encodings.utf8 kernel system ;
diff --git a/extra/file-picker/macosx/authors.txt b/extra/file-picker/macosx/authors.txt
new file mode 100644
index 0000000000..e091bb8164
--- /dev/null
+++ b/extra/file-picker/macosx/authors.txt
@@ -0,0 +1 @@
+John Benediktsson
diff --git a/extra/file-picker/macosx/macosx.factor b/extra/file-picker/macosx/macosx.factor
index 490c9080d1..ecb1e7e0a6 100644
--- a/extra/file-picker/macosx/macosx.factor
+++ b/extra/file-picker/macosx/macosx.factor
@@ -1,3 +1,5 @@
+! Copyright (C) 2014 John Benediktsson.
+! See http://factorcode.org/license.txt for BSD license.
 USING: cocoa.dialogs file-picker system ;
 IN: file-picker.macosx
 
diff --git a/extra/file-picker/windows/authors.txt b/extra/file-picker/windows/authors.txt
new file mode 100644
index 0000000000..dd8231d828
--- /dev/null
+++ b/extra/file-picker/windows/authors.txt
@@ -0,0 +1,3 @@
+John Benediktsson
+Doug Coleman
+Alexander Ilin
diff --git a/extra/file-picker/windows/windows.factor b/extra/file-picker/windows/windows.factor
index ef4f8b78b4..8e83539fe7 100644
--- a/extra/file-picker/windows/windows.factor
+++ b/extra/file-picker/windows/windows.factor
@@ -1,3 +1,6 @@
+! Copyright (C) 2014 John Benediktsson, Doug Coleman.
+! Copyright (C) 2017 Alexander Ilin.
+! See http://factorcode.org/license.txt for BSD license.
 USING: accessors alien.c-types alien.data alien.strings
 alien.syntax classes.struct destructors file-picker
 io.encodings.string io.encodings.utf8 kernel libc literals math