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diff --git a/wirish/include/wirish/pwm.h b/wirish/include/wirish/pwm.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * 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.
+ *****************************************************************************/
+
+/**
+ *  @file pwm.h
+ *
+ *  @brief Arduino-compatible PWM interface.
+ */
+
+#ifndef _WIRISH_PWM_H_
+#define _WIRISH_PWM_H_
+
+#include <libmaple/libmaple_types.h>
+
+/**
+ * As a convenience, analogWrite is an alias of pwmWrite to ease
+ * porting Arduino code.  However, period and duty will have to be
+ * recalibrated.
+ */
+#define analogWrite pwmWrite
+
+/**
+ * Set the PWM duty on the given pin.
+ *
+ * User code is expected to determine and honor the maximum value
+ * (based on the configured period).
+ *
+ * @param pin PWM output pin
+ * @param duty_cycle Duty cycle to set.
+ */
+void pwmWrite(uint8 pin, uint16 duty_cycle);
+
+#endif
+