diff --git a/src/main.cc b/src/main.cc
index 1ae0aea..85fe323 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -18,8 +18,15 @@ void disp_help(char* proname){
 [-k<hole-shape-file>] \
 [-z<control-topography-file>] \
 [-h]";
-	clog << proname << " - v1.4 A generator of the Spherical Triangular Tessellation (STT)." << endl;
-	clog << "Usage: " << exe_name << endl;
+	clog << "       _    _   \n";
+	clog << "  ___ | |_ | |_ \n";
+	clog << " / __|| __|| __|\n";
+	clog << " \\__ \\| |_ | |_ \n";
+	clog << " |___/ \\__| \\__|\n";
+	clog << proname << " - v1.4 - A generator of the Spherical Triangular Tessellation (STT).\n\
+This program is distributed under a dual licensing scheme. It is free for academic use, but a commercial license is required for commercial use.\n\n";
+	clog << "Author: Dr. Yi Zhang (yizhang-geo@zju.edu.cn)\n\n";
+	clog << "Usage: " << exe_name << endl << endl;
 	clog << "Options:" << endl;
 	clog << "\t-d\tMinimal and maximal quad-tree depths of the output STT." << endl;
 	clog << "\t-r\tCoordinate reference system of the output STT, the default is 1e+5/1e+5." << endl;