diff --git a/mitmproxy/tools/cmdline.py b/mitmproxy/tools/cmdline.py
index 68ddc2c8e..93ce6f248 100644
--- a/mitmproxy/tools/cmdline.py
+++ b/mitmproxy/tools/cmdline.py
@@ -73,6 +73,7 @@ def common_options(parser, opts):
     opts.make_parser(group, "upstream_auth", metavar="USER:PASS")
     opts.make_parser(group, "proxyauth", metavar="SPEC")
     opts.make_parser(group, "rawtcp")
+    opts.make_parser(group, "http2")
 
     # Proxy SSL options
     group = parser.add_argument_group("SSL")