diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index 80f28c544b8d3..b07595dc59cdf 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -540,7 +540,7 @@ def render_html_report(test_cases, client_langs, server_langs, resultset,
     html_str = ('%s<h2>Cloud to Prod</h2>\n' 
                 '<table style=\"width:100%%\" border=\"1\">\n'
                 '<tr bgcolor=\"#00BFFF\">\n'
-                '<th/>\n') % html_str
+                '<th>Client languages &#9658;</th>\n') % html_str
     for client_lang in sorted_client_langs:
       html_str = '%s<th>%s\n' % (html_str, client_lang)
     html_str = '%s</tr>\n' % html_str
@@ -560,7 +560,8 @@ def render_html_report(test_cases, client_langs, server_langs, resultset,
       html_str = ('%s<h2>%s</h2>\n' 
                   '<table style=\"width:100%%\" border=\"1\">\n'
                   '<tr bgcolor=\"#00BFFF\">\n'
-                  '<th/>\n') % (html_str, test_case)
+                  '<th>Client languages &#9658;<br/>'
+                  'Server languages &#9660;</th>\n') % (html_str, test_case)
       for client_lang in sorted_client_langs:
         html_str = '%s<th>%s\n' % (html_str, client_lang)
       html_str = '%s</tr>\n' % html_str