diff --git a/data/stackexchange b/data/stackexchange
index e38cb39d..a52b50cc 100644
--- a/data/stackexchange
+++ b/data/stackexchange
@@ -1,7 +1,12 @@
 # Reference: 'https://stackexchange.com/sites'
+
 stackexchange.com
+
 stackoverflow.com
 serverfault.com
 askubuntu.com
 superuser.com
+stackapps.com
+mathoverflow.net
+
 sstatic.net