diff --git a/README.md b/README.md
index 3a9bd1b..bfd8d49 100644
--- a/README.md
+++ b/README.md
@@ -1,23 +1,29 @@
 phytool
 =======
 
-Linux MII register access
-
+Linux MDIO register access
 
 Usage
 -----
 
-    phytool read  iface/phy/reg
-	phytool write iface/phy/reg val
-    phytool print iface/phy[/reg]
-    
-    The PHY argument is either in clause-22 direct adressing syntax, or in
-    clause-45 syntax `port:dev`. Where `port` is the MDIO port address and
-    `dev` is the device's PHY address (0x1-0xA), MAC register (0x10-0x1A),
-    the global register (0x1B), or the global2 register (0x1C)
+    phytool read  IFACE/ADDR/REG
+    phytool write IFACE/ADDR/REG <0-0xffff>
+    phytool print IFACE/ADDR[/REG]
+
+    where
+
+    ADDR := C22 | C45
+    C22  := <0-0x1f>
+    C45  := <0-0x1f>:<0-0x1f>
+    REG  := <0-0x1f>
 
-    Some devices have a SERDES specific page on `dev` address 0xF
+Note: Not all MDIO drivers support the `port:device` Clause 45 address
+      format.
 
+The `read` and `write` commands are simple register level
+accessors. The `print` command will pretty-print a register. When
+using the `print` command, the register is optional. If left out, the
+most common registers will be shown.
 
 Examples
 --------
@@ -25,21 +31,67 @@ Examples
     ~ # phytool read eth4/0/4
     0x0de1
 
-    ~ # phytool print eth4/0
+    ~ # phytool print eth0/0
     ieee-phy: id:0x01410eb1
-    
-       ieee-phy: reg:BMCR(0x00) val:0x0800
-          flags: reset loopback aneg-enable power-down isolate aneg-restart collision-test
-          speed: 10-half
-          ○ ○ ○ ○  ◉ ○ ○ ○  ○ ○ ○ ○  ○ ○ ○ ○
-             0        8        0        0
-    
+
+       ieee-phy: reg:BMCR(0x00) val:0x1140
+          flags:          -reset -loopback +aneg-enable -power-down -isolate -aneg-restart -collision-test
+          speed:          1000-full
+
        ieee-phy: reg:BMSR(0x01) val:0x7949
-          link capabilities: 100-b4 100-f 100-h 10-f 10-h 100-t2-f 100-t2-h
-          flags: ext-status aneg-complete remote-fault aneg-capable link jabber ext-register
-          ○ ◉ ◉ ◉  ◉ ○ ○ ◉  ○ ◉ ○ ○  ◉ ○ ○ ◉
-             7        9        4        9
+          capabilities:   -100-b4 +100-f +100-h +10-f +10-h -100-t2-f -100-t2-h
+          flags:          +ext-status -aneg-complete -remote-fault +aneg-capable -link -jabber +ext-register
+
+
+mv6tool
+=======
+
+Marvell Link Street register access
+
+Usage
+-----
+
+    mv6tool read  LOCATION/REG
+    mv6tool write LOCATION/REG <0-0xffff>
+    mv6tool print LOCATION[/REG]
+    mv6tool print IFACE
+
+    where
+
+    LOCATION := IFACE/<port|phy> | DEV/<ADDR|phyN|portN|globalG|serdes>
+
+    DEV  := <0-0x1f>
+    ADDR := <0-0x1f>
+    N    := <0-0xa>
+    G    := <0-2>
+    REG  := <0-0x1f>
+
+The `read` and `write` commands are simple register level
+accessors. The `print` command will pretty-print a register. When
+using the `print` command, the register is optional. If left out, the
+most common registers will be shown.
+
+Examples
+--------
+
+    ~ # mv6tool 1/global1/0
+    mv6: model:mv88e6097 dev:1 global:1
+       mv6: reg:00 val:0xc800
+
+    ~ # mv6tool print eth1-1
+    mv6: model:mv88e6352 dev:0 port:1
+       mv6: reg:PS(0x00) val:0x100f
+          flags:          -pause-en -my-pause +phy-detect -link -eee -tx-paused -flow-ctrl
+          speed:          10-half
+          mode:           0xf
 
+       mv6: reg:PC(0x04) val:0x1414
+          flags:          -router-header +igmp-snoop -vlan-tunnel -tag-if-both
+          egress-mode:    01, untagged
+          frame-mode:     00, normal
+          initial-pri:    01, tag prio
+          egress-floods:  01, allow UC
+          port-state:     00, disabled
 
 Origin & References
 -------------------