diff --git a/Wiki/Software Index.md b/Wiki/Software Index.md
index 5278c36..372bfef 100644
--- a/Wiki/Software Index.md	
+++ b/Wiki/Software Index.md	
@@ -53,6 +53,8 @@
   * record screen
 * tree
   * to show things in a tree
+* pexpect
+	* developing python program
 
 #### Softwares
 * imv