diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index a519d6c1fc..8c035c3c6c 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -225,7 +225,7 @@ def remote_ip
       @remote_ip ||= (@env["action_dispatch.remote_ip"] || ip).to_s
     end
 
-    # Returns the unique request id, which is based off either the X-Request-Id header that can
+    # Returns the unique request id, which is based on either the X-Request-Id header that can
     # be generated by a firewall, load balancer, or web server or by the RequestId middleware
     # (which sets the action_dispatch.request_id environment variable).
     #
diff --git a/actionpack/lib/action_dispatch/middleware/request_id.rb b/actionpack/lib/action_dispatch/middleware/request_id.rb
index 5d1740d0d4..25658bac3d 100644
--- a/actionpack/lib/action_dispatch/middleware/request_id.rb
+++ b/actionpack/lib/action_dispatch/middleware/request_id.rb
@@ -5,7 +5,7 @@ module ActionDispatch
   # Makes a unique request id available to the action_dispatch.request_id env variable (which is then accessible through
   # ActionDispatch::Request#uuid) and sends the same id to the client via the X-Request-Id header.
   #
-  # The unique request id is either based off the X-Request-Id header in the request, which would typically be generated
+  # The unique request id is either based on the X-Request-Id header in the request, which would typically be generated
   # by a firewall, load balancer, or the web server, or, if this header is not available, a random uuid. If the
   # header is accepted from the outside world, we sanitize it to a max of 255 chars and alphanumeric and dashes only.
   #