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diff --git a/src/shrpx_rate_limit.h b/src/shrpx_rate_limit.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2015 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_RATE_LIMIT_H
+#define SHRPX_RATE_LIMIT_H
+
+#include "shrpx.h"
+
+#include <ev.h>
+
+#include <openssl/ssl.h>
+
+namespace shrpx {
+
+struct Connection;
+
+class RateLimit {
+public:
+  // We need |conn| object to check that it has unread bytes for TLS
+  // connection.
+  RateLimit(struct ev_loop *loop, ev_io *w, size_t rate, size_t burst,
+            Connection *conn = nullptr);
+  ~RateLimit();
+  size_t avail() const;
+  void drain(size_t n);
+  void regen();
+  void startw();
+  void stopw();
+  // Feeds event if conn_->tls object has unread bytes.  This is
+  // required since it is buffered in conn_->tls object, io event is
+  // not generated unless new incoming data is received.
+  void handle_tls_pending_read();
+
+private:
+  ev_timer t_;
+  ev_io *w_;
+  struct ev_loop *loop_;
+  Connection *conn_;
+  size_t rate_;
+  size_t burst_;
+  size_t avail_;
+  bool startw_req_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_RATE_LIMIT_H