diff --git a/lib/function/algebra/index.js b/lib/function/algebra/index.js
index 0a1920744..f500f5589 100644
--- a/lib/function/algebra/index.js
+++ b/lib/function/algebra/index.js
@@ -1,6 +1,10 @@
 module.exports = [
   require('./derivative'),
   require('./derivative.transform'),
+	
+	// simplify
+  require('./simplify'),
+  require('./simplify.transform'),
 
   // decomposition
   require('./decomposition/lup'),