little annoying problem with anti splog

I am writing an article on how to combat spam and every time I write wp-signup.php in a post it gets replaced by anti splog with my current signup URL

this is pointless and annoying... I was trying i.e. to publish this code:

# BEGIN ANTISPAMBLOG REGISTRATION
RewriteEngine On
RewriteCond %{REQUEST_METHOD} POST
RewriteCond %{REQUEST_URI} .wp-signup.php*
RewriteCond %{HTTP_REFERER} !.zice.ro. [OR]
RewriteCond %{HTTP_USER_AGENT} ^$
RewriteRule (.*) http://die-spammers.com/ [R=301,L]

and wp-signup.php gets replace in my article. can this be fixed please? the above code is inside code tags but that doesn't help!