diff --git a/README.md b/README.md
index 548b8bc4..ef1903e5 100644
--- a/README.md
+++ b/README.md
@@ -149,7 +149,7 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
 - [util/sum](https://openhome.cc/eGossip/OpenSCAD/lib2x-sum.html)
 - [util/zip](https://openhome.cc/eGossip/OpenSCAD/lib2x-zip.html)
 - [util/lerp](https://openhome.cc/eGossip/OpenSCAD/lib2x-lerp.html)
-- [util/choose](https://openhome.cc/eGossip/OpenSCAD/lib2x-choose.html)
+- [util/choose](https://openhome.cc/eGossip/OpenSCAD/lib3x-choose.html)
 
 ### Matrix
 - [matrix/m_cumulate](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_cumulate.html)	
diff --git a/docs/lib2x-choose.md b/docs/lib3x-choose.md
similarity index 100%
rename from docs/lib2x-choose.md
rename to docs/lib3x-choose.md
diff --git a/src/util/choose.scad b/src/util/choose.scad
index f85bbe08..939d2cc4 100644
--- a/src/util/choose.scad
+++ b/src/util/choose.scad
@@ -4,7 +4,7 @@
 * @copyright Justin Lin, 2021
 * @license https://opensource.org/licenses/lgpl-3.0.html
 *
-* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-choose.html
+* @see https://openhome.cc/eGossip/OpenSCAD/lib3x-choose.html
 *
 **/
 
diff --git a/test/test_all.scad b/test/test_all.scad
index 6ac9304c..6ae6677f 100644
--- a/test/test_all.scad
+++ b/test/test_all.scad
@@ -68,6 +68,7 @@ include <util/test_sort.scad>;
 include <util/test_reverse.scad>;
 include <util/test_fibseq.scad>;
 include <util/test_bsearch.scad>;
+include <util/test_choose.scad>;
 
 // Voxel
 include <voxel/test_vx_line.scad>;
diff --git a/test/util/test_choose.scad b/test/util/test_choose.scad
new file mode 100644
index 00000000..081a809d
--- /dev/null
+++ b/test/util/test_choose.scad
@@ -0,0 +1,11 @@
+use <util/choose.scad>;
+
+module test_choose() {
+    echo("==== test_choose ====");
+
+    lt = [[1, true], [2, true], [3, true], [4, true], [5, true]];
+    c = choose(lt);
+    assert(c[1]);
+}
+
+test_choose();
\ No newline at end of file