diff --git a/README.md b/README.md
index 99c9de21b..b24b2a5c6 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,8 @@ Several APIs may be used to get flash chip info:
 
 ```ESP.getFlashChipSpeed(void)``` returns the flash chip frequency, in Hz.
 
+```ESP.getCycleCount()``` returns the cpu instruction cycle count since start as an unsigned 32-bit.  This is useful for accurate timing of very short actions like bit banging.
+
 
 #### OneWire (from https://www.pjrc.com/teensy/td_libs_OneWire.html) ####
 
@@ -181,7 +183,8 @@ Libraries that don't rely on low-level access to AVR registers should work well.
 - [PubSubClient](https://github.com/knolleary/pubsubclient) MQTT library. Use this [sample](https://gist.github.com/igrr/7f7e7973366fc01d6393) to get started.
 - [DHT11](https://github.com/adafruit/DHT-sensor-library) - initialize DHT as follows: ```DHT dht(DHTPIN, DHTTYPE, 15);```
 - [DallasTemperature](https://github.com/milesburton/Arduino-Temperature-Control-Library.git)
-
+- [NeoPixelBus](https://github.com/Makuna/NeoPixelBus) - Arduino NeoPixel library compatible with esp8266.
+- [RTC](https://github.com/Makuna/Rtc) - Arduino Library for Ds1307 & Ds3231 compatible with esp8266.
 
 #### Upload via serial port ####
 Pick the correct serial port.