Source

File: wp-includes/pomo/po.php

function add_comment_to_entry( &$entry, $po_comment_line ) {
			$first_two = substr( $po_comment_line, 0, 2 );
			$comment   = trim( substr( $po_comment_line, 2 ) );
			if ( '#:' === $first_two ) {
				$entry->references = array_merge( $entry->references, preg_split( '/\s+/', $comment ) );
			} elseif ( '#.' === $first_two ) {
				$entry->extracted_comments = trim( $entry->extracted_comments . "\n" . $comment );
			} elseif ( '#,' === $first_two ) {
				$entry->flags = array_merge( $entry->flags, preg_split( '/,\s*/', $comment ) );
			} else {
				$entry->translator_comments = trim( $entry->translator_comments . "\n" . $comment );
			}
		}