diff --git a/README.md b/README.md
index 652f986e..3afdbfd7 100644
--- a/README.md
+++ b/README.md
@@ -29,14 +29,26 @@ KALEIDOSCOPE_INIT_PLUGINS(LEDRainbowEffect, LEDRainbowWaveEffect);
 
 void setup() {
   Kaleidoscope.setup();
+
+  LEDRainbowEffect.brightness(150);
+  LEDRainbowWaveEffect.brightness(150);
+  LEDRainbowWaveEffect.delay(50);
 }
 ```
 
 ## Plugin methods
 
 The plugin provides two objects: `LEDRainbowEffect`, and `LEDRainbowWaveEffect`,
-neither of which have any public methods or properties, outside of those
-provided by all LED modes.
+both of which provide the following methods:
+
+### `.brightness(brightness)`
+
+Sets the LED brightness for the effect.
+
+### `.update_delay(delay)`
+
+Sets the number of miliseconds between effect updates.
+Smaller number = faster rainbows.
 
 ## Dependencies
 
diff --git a/src/Kaleidoscope-LEDEffect-Rainbow.cpp b/src/Kaleidoscope-LEDEffect-Rainbow.cpp
index 5fdbcc5f..a8a4f21e 100644
--- a/src/Kaleidoscope-LEDEffect-Rainbow.cpp
+++ b/src/Kaleidoscope-LEDEffect-Rainbow.cpp
@@ -23,6 +23,10 @@ void LEDRainbowEffect::brightness(byte brightness) {
   rainbow_value = brightness;
 }
 
+void LEDRainbowEffect::update_delay(byte delay) {
+  rainbow_update_delay = delay;
+}
+
 
 // ---------
 
@@ -51,6 +55,10 @@ void LEDRainbowWaveEffect::update(void) {
 void LEDRainbowWaveEffect::brightness(byte brightness) {
   rainbow_value = brightness;
 }
+
+void LEDRainbowWaveEffect::updat_delay(byte delay) {
+  rainbow_update_delay = delay;
+}
 }
 
 kaleidoscope::LEDRainbowEffect LEDRainbowEffect;
diff --git a/src/Kaleidoscope-LEDEffect-Rainbow.h b/src/Kaleidoscope-LEDEffect-Rainbow.h
index e3a66210..bd87d998 100644
--- a/src/Kaleidoscope-LEDEffect-Rainbow.h
+++ b/src/Kaleidoscope-LEDEffect-Rainbow.h
@@ -9,6 +9,7 @@ class LEDRainbowEffect : public LEDMode {
   LEDRainbowEffect(void) {}
 
   void brightness(byte);
+  void update_delay(byte);
   void update(void) final;
 
  private:
@@ -28,6 +29,7 @@ class LEDRainbowWaveEffect : public LEDMode {
   LEDRainbowWaveEffect(void) {}
 
   void brightness(byte);
+  void update_delay(byte);
   void update(void) final;
 
  private: