Bash-4.0 patchlevel 38

doc/bash.1

@@ -8257,9 +8257,10 @@ and group ids to be set to the real user and group ids.
 Exit after reading and executing one command.
 .TP 8
 .B \-u
-Treat unset variables as an error when performing
+Treat unset variables and parameters other than the special
+parameters "@" and "*" as an error when performing
 parameter expansion.  If expansion is attempted on an
-unset variable, the shell prints an error message, and,
+unset variable or parameter, the shell prints an error message, and,
 if not interactive, exits with a non-zero status.
 .TP 8
 .B \-v