diff --git a/ADBLOCKING.md b/ADBLOCKING.md
index b9536de7..08c1fa12 100644
--- a/ADBLOCKING.md
+++ b/ADBLOCKING.md
@@ -16,7 +16,7 @@ Instructions:
 
 Troubleshooting:
 
-Because of routing bugs some devices/Android versions require:
+Because of routing bugs, some devices/Android versions require:
 
 * the advanced option *Manage system applications* to be enabled and/or
 * two (not just one) custom DNS server addresses to be set in the advanced options