WordPress at a glance
filter is not described

the_content_rss filter-hook . WP 0.71

Filters the post content in the context of an RSS feed.

Usage

add_filter( 'the_content_rss', 'filter_function_name_9924' );
function filter_function_name_9924( $content ){
	// filter...

	return $content;
}
$content(string)
Content of the current post.

Where the hook is called

the_content_rss()
wp-includes/deprecated.php 1663
$content = apply_filters('the_content_rss', $content);

Where the hook is used (in WP core)

wp-includes/default-filters.php 205
add_filter( 'the_content_rss', 'ent2ncr', 8 );