diff --git a/Zhou2021AFED-EF_Sourcecode/README.txt b/Zhou2021AFED-EF_Sourcecode/README.txt
index 6ab053c94722706a6d5e6b99b4892606292f1819..d43f3782d9334fafa8df566ee8a93902ad85895e 100644
--- a/Zhou2021AFED-EF_Sourcecode/README.txt
+++ b/Zhou2021AFED-EF_Sourcecode/README.txt
@@ -4,7 +4,7 @@ Dr Zhou Zhou did this implementation.
 Dr Mohammad Shojafar helped on idea brainstorming and documentation. 
 Professors Abawajy, Alazab and Li helped in English correction and leading the team.
 
-Contact:
+Contact: 
 
 Dr Zhou Zhou
 Department of mathematics and computer science, Changsha University, Changsha, China