diff --git a/synapse/config/ratelimiting.py b/synapse/config/ratelimiting.py
index 54b71e684..093042fdb 100644
--- a/synapse/config/ratelimiting.py
+++ b/synapse/config/ratelimiting.py
@@ -27,6 +27,13 @@ class RatelimitConfig(Config):
         self.federation_rc_reject_limit = config["federation_rc_reject_limit"]
         self.federation_rc_concurrent = config["federation_rc_concurrent"]
 
+        self.rc_registration_requests_per_second = config.get(
+            "rc_registration_requests_per_second", 0.17,
+        )
+        self.rc_registration_request_burst_count = config.get(
+            "rc_registration_request_burst_count", 3,
+        )
+
     def default_config(self, **kwargs):
         return """\
         ## Ratelimiting ##
@@ -62,4 +69,15 @@ class RatelimitConfig(Config):
         # single server
         #
         federation_rc_concurrent: 3
+
+        # Number of registration requests a client can send per second.
+        # Defaults to 1/minute (0.17).
+        #
+        #rc_registration_requests_per_second: 0.17
+
+        # Number of registration requests a client can send before being
+        # throttled.
+        # Defaults to 3.
+        #
+        #rc_registration_request_burst_count: 3.0
         """
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index d32f6fff7..d34dc9e45 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -54,13 +54,6 @@ class RegistrationConfig(Config):
             config.get("disable_msisdn_registration", False)
         )
 
-        self.rc_registration_requests_per_second = config.get(
-            "rc_registration_requests_per_second", 0.17,
-        )
-        self.rc_registration_request_burst_count = config.get(
-            "rc_registration_request_burst_count", 3,
-        )
-
     def default_config(self, generate_secrets=False, **kwargs):
         if generate_secrets:
             registration_shared_secret = 'registration_shared_secret: "%s"' % (
@@ -71,6 +64,8 @@ class RegistrationConfig(Config):
 
         return """\
         ## Registration ##
+        # Registration can be rate-limited using the parameters in the "Ratelimiting"
+        # section of this file.
 
         # Enable registration for new users.
         enable_registration: False
@@ -147,17 +142,6 @@ class RegistrationConfig(Config):
         # users cannot be auto-joined since they do not exist.
         #
         autocreate_auto_join_rooms: true
-
-        # Number of registration requests a client can send per second.
-        # Defaults to 1/minute (0.17).
-        #
-        #rc_registration_requests_per_second: 0.17
-
-        # Number of registration requests a client can send before being
-        # throttled.
-        # Defaults to 3.
-        #
-        #rc_registration_request_burst_count: 3.0
         """ % locals()
 
     def add_arguments(self, parser):