diff --git a/util/superiotool/README b/util/superiotool/README
index f0294d4..9fef630 100644
--- a/util/superiotool/README
+++ b/util/superiotool/README
@@ -28,12 +28,13 @@
 Usage
 -----
 
-  $ superiotool [-d] [-V] [-v] [-h]
+ $ superiotool [-d] [-D] [-V] [-v] [-h]
 
-  -d | --dump      Dump Super I/O registers
-  -V | --verbose   Verbose mode
-  -v | --version   Show the superiotool version
-  -h | --help      Show a short help text
+ -d | --dump            Dump Super I/O registers
+ -D | --dump-readable   Dump Super I/O registers in human-readable format
+ -V | --verbose         Verbose mode
+ -v | --version         Show the superiotool version
+ -h | --help            Show a short help text
 
 Per default (no options) superiotool will just probe for a Super I/O
 and print its vendor, name, ID, version, and config port.
@@ -44,10 +45,14 @@
 
    $ superiotool
 
- - Detailed register dump of the Super I/O (if detected):
+ - Register dump as table of hex-values of the Super I/O (if detected):
 
    $ superiotool -d
 
+ - Detailed register dump in human-readable format:
+
+   $ superiotool -D
+
 
 Supported Super I/O Chips
 -------------------------