diff --git a/IODevice.h b/IODevice.h
index eaebaf7..3ff1dbe 100644
--- a/IODevice.h
+++ b/IODevice.h
@@ -276,7 +276,7 @@ private:
  
 class PCA9685 : public IODevice {
 public:
-  static void create(VPIN vpin, int nPins, I2CAddress i2cAddress);
+  static void create(VPIN vpin, int nPins, I2CAddress i2cAddress, uint16_t frequency = 50);
   enum ProfileType : uint8_t {
     Instant = 0,  // Moves immediately between positions (if duration not specified)
     UseDuration = 0, // Use specified duration
@@ -289,7 +289,7 @@ public:
 
 private:
   // Constructor
-  PCA9685(VPIN vpin, int nPins, I2CAddress i2cAddress);
+  PCA9685(VPIN vpin, int nPins, I2CAddress i2cAddress, uint16_t frequency);
   // Device-specific initialisation
   void _begin() override;
   bool _configure(VPIN vpin, ConfigTypeEnum configType, int paramCount, int params[]) override;