diff --git a/Future-Modules.md b/Future-Modules.md
index 9d0c78a..17dc679 100644
--- a/Future-Modules.md
+++ b/Future-Modules.md
@@ -124,6 +124,8 @@ Everybody needs several VCFs with different behaviors.
 
 ## Wave Shaper
 
+#### Wave Folder using LM13700: https://kassu2000.blogspot.com/2021/11/wavefolder.html
+
 ## Ring Modulator
 #### https://www.schmitzbits.de/ringmodplus.png
 #### http://yusynth.net/Modular/EN/RINGMOD/index.html