diff --git a/User-Manual---Command-Reference.md b/User-Manual---Command-Reference.md
index b696474..5adac91 100644
--- a/User-Manual---Command-Reference.md
+++ b/User-Manual---Command-Reference.md
@@ -944,7 +944,7 @@ _Usage: in \<address\> \[ \<count\> \]_
 
 The optional count parameter causes the operation to be repeated multiple times. If omitted, count defaults to 1.
 
-## io (io)
+## io (i)
 
 Dumps a block 256 bytes of host IO space in hex and ascii.