diff --git a/Documentation/hwmon/mcp3021 b/Documentation/hwmon/mcp3021
index 325fd87..74a6b72 100644
--- a/Documentation/hwmon/mcp3021
+++ b/Documentation/hwmon/mcp3021
@@ -5,18 +5,25 @@
   * Microchip Technology MCP3021
     Prefix: 'mcp3021'
     Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21805a.pdf
+  * Microchip Technology MCP3221
+    Prefix: 'mcp3221'
+    Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21732c.pdf
 
-Author: Mingkai Hu
+Authors:
+   Mingkai Hu
+   Sven Schuchmann <schuchmann@schleissheimer.de>
 
 Description
 -----------
 
-This driver implements support for the Microchip Technology MCP3021 chip.
+This driver implements support for the Microchip Technology MCP3021 and
+MCP3221 chip.
 
 The Microchip Technology Inc. MCP3021 is a successive approximation A/D
-converter (ADC) with 10-bit resolution.
-This device provides one single-ended input with very low power consumption.
-Communication to the MCP3021 is performed using a 2-wire I2C compatible
-interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are available.
-The default I2C device address is 0x4d (contact the Microchip factory for
-additional address options).
+converter (ADC) with 10-bit resolution. The MCP3221 has 12-bit resolution.
+
+These devices provide one single-ended input with very low power consumption.
+Communication to the MCP3021/MCP3221  is performed using a 2-wire I2C
+compatible interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are
+available. The default I2C device address is 0x4d (contact the Microchip
+factory for additional address options).