diff --git a/README.md b/README.md
index d91b932..ed8ade3 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,7 @@ platforms.
 * **PWM** [Documentation](http://godoc.org/github.com/kidoman/embd#PWMPin)
 * **I2C** [Documentation](http://godoc.org/github.com/kidoman/embd#I2CBus)
 * **LED** [Documentation](http://godoc.org/github.com/kidoman/embd#LED)
+* **SPI** [Documentation](http://godoc.org/github.com/kidoman/embd#SPIBus)
 
 ## Sensors Supported
 
@@ -237,6 +238,10 @@ platforms.
 
 * **ServoBlaster** RPi PWM/PCM based PWM controller [Documentation](http://godoc.org/github.com/kidoman/embd/controller/servoblaster), [Product Page](https://github.com/richardghirst/PiBits/tree/master/ServoBlaster)
 
+## Convertors
+
+* **MCP3008** 8-channel, 10-bit ADC with SPI protocol, [Datasheet](https://www.adafruit.com/datasheets/MCP3008.pdf)
+
 ## Contributing
 
 We look forward to your pull requests, but contributions which abide by the [guidelines](https://github.com/kidoman/embd/blob/master/CONTRIBUTING.md) will get a free beer!
diff --git a/convertors/mcp3008/mcp3008.go b/convertors/mcp3008/mcp3008.go
index 716d437..0159bd1 100644
--- a/convertors/mcp3008/mcp3008.go
+++ b/convertors/mcp3008/mcp3008.go
@@ -1,3 +1,4 @@
+// Package mcp3008 allows interfacing with the mcp3008 8-channel, 10-bit ADC through SPI protocol.
 package mcp3008
 
 import (