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diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index c2b5393..aea7998 100644
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -341,6 +341,11 @@ that enabled the use of Unicode-aware "wide system call" Win32 APIs.
 This feature was practically unused, however, and the command line
 switch was therefore "recycled".)
 
+B<Note:> Since perl 5.10.0, the -C option can no longer be used
+on the #! line. It wasn't working there anyway, since the standard streams
+are already set up at this point in the execution of the perl interpreter.
+You can use binmode() instead to get the desired behaviour.
+
 =item B<-c>
 X<-c>
 
@@ -655,6 +660,10 @@ Note that the lines are not printed by default.  See B<-p> to have
 lines printed.  If a file named by an argument cannot be opened for
 some reason, Perl warns you about it and moves on to the next file.
 
+Also note that C<< <> >> passes command line arguments to
+L<perlfunc/open>, which doesn't necessarily interpret them as file names.
+See  L<perlop> for possible security implications.
+
 Here is an efficient way to delete all files that haven't been modified for
 at least a week: