diff --git a/README b/README
index b5c1c03..6bf678a 100644
--- a/README
+++ b/README
@@ -838,6 +838,7 @@ The following options need to be configured:
 		CONFIG_CMD_IMMAP	* IMMR dump support
 		CONFIG_CMD_IMPORTENV	* import an environment
 		CONFIG_CMD_INI		* import data from an ini file into the env
+		CONFIG_CMD_IO		* x86 IO access
 		CONFIG_CMD_IRQ		* irqinfo
 		CONFIG_CMD_ITEST	  Integer/string test of 2 values
 		CONFIG_CMD_JFFS2	* JFFS2 Support