Index: sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/searchform.php
===================================================================
--- sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/searchform.php	(revision 2292)
+++ sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/searchform.php	(working copy)
@@ -55,7 +55,7 @@
 					$qv_post_type = (array) get_query_var( 'post_type' );
 				?>
 					<label><input type="checkbox" name="post_type[]" value="<?php echo esc_attr( $post_type ); ?>"
-					<?php checked( ! is_search() || in_array( 'any', $qv_post_type ) || in_array( $post_type, $qv_post_type ) ); ?> /> <?php echo $label; ?></label>
+					<?php checked( ( is_page( 'reference' )  && ( 'wp-parser-function' === $post_type ) ) || in_array( 'any', $qv_post_type ) || in_array( $post_type, $qv_post_type ) ); ?> /> <?php echo $label; ?></label>
 				<?php } ?>
 		</div>
 	</form>