diff --git a/src/util/reverse.scad b/src/util/reverse.scad
index d2696b02..f092b094 100644
--- a/src/util/reverse.scad
+++ b/src/util/reverse.scad
@@ -1,7 +1,7 @@
 /**
 * reverse.scad
 *
-* @copyright Justin Lin, 2017
+* @copyright Justin Lin, 2019
 * @license https://opensource.org/licenses/lgpl-3.0.html
 *
 * @see https://openhome.cc/eGossip/OpenSCAD/lib2-reverse.html
diff --git a/src/util/slice.scad b/src/util/slice.scad
index 0eb9c0c5..9522a958 100644
--- a/src/util/slice.scad
+++ b/src/util/slice.scad
@@ -1,7 +1,7 @@
 /**
 * slice.scad
 *
-* @copyright Justin Lin, 2017
+* @copyright Justin Lin, 2019
 * @license https://opensource.org/licenses/lgpl-3.0.html
 *
 * @see https://openhome.cc/eGossip/OpenSCAD/lib2-slice.html
diff --git a/src/util/sort.scad b/src/util/sort.scad
index 0c51290a..ddf98614 100644
--- a/src/util/sort.scad
+++ b/src/util/sort.scad
@@ -1,7 +1,7 @@
 /**
 * sort.scad
 *
-* @copyright Justin Lin, 2017
+* @copyright Justin Lin, 2019
 * @license https://opensource.org/licenses/lgpl-3.0.html
 *
 * @see https://openhome.cc/eGossip/OpenSCAD/lib2-sort.html