- <?php echo get_avatar( get_the_author_meta( 'user_email' ), apply_filters( 'twentythirteen_author_bio_avatar_size', 74 ) ); ?>
+ <?php
+ /**
+ * Filter the author bio avatar size.
+ *
+ * @since Twenty Thirteen 1.0
+ *
+ * @param int $size The avatar height and width size in pixels.
+ */
+ $author_bio_avatar_size = apply_filters( 'twentythirteen_author_bio_avatar_size', 74 );
+ echo get_avatar( get_the_author_meta( 'user_email' ), $author_bio_avatar_size );
+ ?>