# if caller() is called from the package DB, it provides some
# additional data.
#
-# The array @{$main::{'_<'.$filename} is the line-by-line contents of
+# The array @{$main::{'_<'.$filename}} is the line-by-line contents of
# $filename.
#
# The hash %{'_<'.$filename} contains breakpoints and action (it is