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diff --git a/pod/perlsub.pod b/pod/perlsub.pod
index 7a51e5c..5ecd346 100644
--- a/pod/perlsub.pod
+++ b/pod/perlsub.pod
@@ -227,10 +227,10 @@ indirectly by the run-time system itself, usually due to a triggered event.
 Subroutines that do special, pre-defined things include C<AUTOLOAD>, C<CLONE>,
 C<DESTROY> plus all functions mentioned in L<perltie> and L<PerlIO::via>.
 
-The C<BEGIN>, C<CHECK>, C<INIT> and C<END> subroutines are not so much
-subroutines as named special code blocks, of which you can have more
-than one in a package, and which you can B<not> call explicitly.  See
-L<perlmod/"BEGIN, CHECK, INIT and END">
+The C<BEGIN>, C<UNITCHECK>, C<CHECK>, C<INIT> and C<END> subroutines
+are not so much subroutines as named special code blocks, of which you
+can have more than one in a package, and which you can B<not> call
+explicitly.  See L<perlmod/"BEGIN, UNITCHECK, CHECK, INIT and END">
 
 =head2 Private Variables via my()
 X<my> X<variable, lexical> X<lexical> X<lexical variable> X<scope, lexical>
@@ -521,8 +521,9 @@ starts to run:
 	}
     }
 
-See L<perlmod/"BEGIN, CHECK, INIT and END"> about the
-special triggered code blocks, C<BEGIN>, C<CHECK>, C<INIT> and C<END>.
+See L<perlmod/"BEGIN, UNITCHECK, CHECK, INIT and END"> about the
+special triggered code blocks, C<BEGIN>, C<UNITCHECK>, C<CHECK>,
+C<INIT> and C<END>.
 
 If declared at the outermost scope (the file scope), then lexicals
 work somewhat like C's file statics.  They are available to all
@@ -1054,7 +1055,7 @@ corresponding built-in.
     sub myopen (*;$)	     myopen HANDLE, $name
     sub mypipe (**)	     mypipe READHANDLE, WRITEHANDLE
     sub mygrep (&@)	     mygrep { /foo/ } $a, $b, $c
-    sub myrand ($)	     myrand 42
+    sub myrand (;$)	     myrand 42
     sub mytime ()	     mytime
 
 Any backslashed prototype character represents an actual argument
@@ -1098,9 +1099,13 @@ follows:
 	...
     }
 
-A semicolon separates mandatory arguments from optional arguments.
+A semicolon (C<;>) separates mandatory arguments from optional arguments.
 It is redundant before C<@> or C<%>, which gobble up everything else.
 
+As the last character of a prototype, or just before a semicolon, you can
+use C<_> in place of C<$>: if this argument is not provided, C<$_> will be
+used instead.
+
 Note how the last three examples in the table above are treated
 specially by the parser.  C<mygrep()> is parsed as a true list
 operator, C<myrand()> is parsed as a true unary operator with unary
@@ -1367,7 +1372,8 @@ And, as you'll have noticed from the previous example, if you override
 C<glob>, the C<< <*> >> glob operator is overridden as well.
 
 In a similar fashion, overriding the C<readline> function also overrides
-the equivalent I/O operator C<< <FILEHANDLE> >>.
+the equivalent I/O operator C<< <FILEHANDLE> >>. Also, overriding
+C<readpipe> also overrides the operators C<``> and C<qx//>.
 
 Finally, some built-ins (e.g. C<exists> or C<grep>) can't be overridden.