add perl coding standard of perlstyle
Client: perl
diff --git a/lib/perl/coding_standards.md b/lib/perl/coding_standards.md
index fa0390b..e4e8255 100644
--- a/lib/perl/coding_standards.md
+++ b/lib/perl/coding_standards.md
@@ -1 +1,2 @@
-Please follow [General Coding Standards](/doc/coding_standards.md)
+Please follow [General Coding Standards](/doc/coding_standards.md).
+Additional perl coding standards can be found in [perlstyle](http://perldoc.perl.org/perlstyle.html).