diff --git a/threadlib.scad b/threadlib.scad
index f1e6d21..8754604 100644
--- a/threadlib.scad
+++ b/threadlib.scad
@@ -9,6 +9,8 @@ Create threads easily.
 :License: 3-Clause BSD. See LICENSE.
 */
 
+function __THREADLIB_VERSION() = 0.1;
+
 use <thread_profile.scad>
 include <THREAD_TABLE.scad>