WordPress at a glance
filter is not described

rss_update_frequency filter-hook . WP 1.0

This filter is documented in wp-includes/feed-rss2.php

Usage

add_filter( 'rss_update_frequency', 'filter_function_name_2411' );
function filter_function_name_2411( $string ){
	// filter...

	return $string;
}
$string
-

Where the hook is called

In file: /wp-includes/feed-rss2-comments.php
rss_update_frequency
wp-includes/feed-rss2-comments.php 62
echo apply_filters( 'rss_update_frequency', '1' );
wp-includes/feed-rss2.php 74
echo apply_filters( 'rss_update_frequency', $frequency );
wp-includes/feed-rdf.php 46
echo apply_filters( 'rss_update_frequency', '1' );

Where in WP core the hook is used WordPress

Usage not found.