diff --git a/letsencrypt/cli.py b/letsencrypt/cli.py
index 4b0e271f7..3bdf2bfc6 100644
--- a/letsencrypt/cli.py
+++ b/letsencrypt/cli.py
@@ -252,6 +252,9 @@ def create_parser(plugins):
     add("-t", "--text", dest="text_mode", action="store_true",
         help="Use the text output instead of the curses UI.")
 
+    add("--no-simple-http-tls", action="store_true",
+        help=config_help("no_simple_http_tls"))
+
     testing_group = parser.add_argument_group(
         "testing", description="The following flags are meant for "
         "testing purposes only! Do NOT change them, unless you "
diff --git a/letsencrypt/interfaces.py b/letsencrypt/interfaces.py
index e47eea6cc..c0d44a134 100644
--- a/letsencrypt/interfaces.py
+++ b/letsencrypt/interfaces.py
@@ -188,6 +188,10 @@ class IConfig(zope.interface.Interface):
         "Port number to perform DVSNI challenge. "
         "Boulder in testing mode defaults to 5001.")
 
+    # TODO: not implemented
+    no_simple_http_tls = zope.interface.Attribute(
+        "Do not use TLS when solving SimpleHTTP challenges.")
+
 
 class IInstaller(IPlugin):
     """Generic Let's Encrypt Installer Interface.