diff --git a/Discovery/Web-Content/web-all-content-types.txt b/Discovery/Web-Content/web-all-content-types.txt
index f6cbbc0a..6559457b 100644
--- a/Discovery/Web-Content/web-all-content-types.txt
+++ b/Discovery/Web-Content/web-all-content-types.txt
@@ -16,8 +16,12 @@ application/dssc+xml
 application/ecmascript
 application/emma+xml
 application/epub+zip
+application/json+protobuf
 application/exi
+application/vnd.google.protobuf
 application/font-tdpfr
+application/x-google-protobuf
+application/x-protobuf
 application/hyperstudio
 application/ipfix
 application/java-archive