diff --git a/qsdsan/utils/indices.py b/qsdsan/utils/indices.py
index f5b7afad..4d013460 100644
--- a/qsdsan/utils/indices.py
+++ b/qsdsan/utils/indices.py
@@ -7,6 +7,8 @@
     
     Yalin Li <mailto.yalin.li@gmail.com>
 
+    Ali Ahmad <aa3056@scarletmail.rutgers.edu>
+
 This module is under the University of Illinois/NCSA Open Source License.
 Please refer to https://github.com/QSD-Group/QSDsan/blob/main/LICENSE.txt
 for license details.