be more clear about the impact of blocked contacts

src/main/res/values/strings.xml

@@ -376,7 +376,7 @@
     <string name="ask_forward">Forward messages to %1$s?</string>
     <string name="ask_forward_multiple">Forward messages to %1$d chats?</string>
     <string name="ask_export_attachment">Exporting attachments will allow other apps on your device to access them.\n\nContinue?</string>
-    <string name="ask_block_contact">Block this contact? You will no longer receive messages from them.</string>
+    <string name="ask_block_contact">Block this contact?\n\nDirect messages or new groups from blocked contacts will not show up.\n\nExisting groups with blocked contacts will still show their messages.</string>
     <string name="ask_unblock_contact">Unblock this contact? You will then be able to receive messages from them.</string>
     <string name="ask_delete_contacts">Delete contacts?\n\nContacts with ongoing chats or from the system address book cannot be deleted permanently.</string>
     <string name="ask_delete_contact">Delete contact %1$s?\n\nContacts with ongoing chats or from the system address book cannot be deleted permanently.</string>