diff --git a/www/wp-content/themes/enfold-cille/functions.php b/www/wp-content/themes/enfold-cille/functions.php
index dc827ab..befca8d 100644
--- a/www/wp-content/themes/enfold-cille/functions.php
+++ b/www/wp-content/themes/enfold-cille/functions.php
@@ -7,17 +7,16 @@
  */
 
 
-if ( !function_exists( 'write_log' ) ) {
-	function write_log( $log )  {
-#   if ( true === WP_DEBUG ) {
-		if ( is_array( $log ) || is_object( $log ) ) {
-			error_log( print_r( $log, true ), 3, '/tmp/manuel.cillero.errors.log' );
-		}
-		else {
-			error_log( "$log\n", 3, '/tmp/manuel.cillero.errors.log' );
-		}
-#   }
+/*
+ * Add help text to screen in a metabox.
+ * See https://code.tutsplus.com/articles/customizing-the-wordpress-admin-help-text--wp-33281
+ */
+add_action( 'add_meta_boxes', 'help_featured_image_metabox' );
+function help_featured_image_metabox() {
+    add_meta_box( 'help-featured-image', 'Sobre la imagen destacada', 'help_featured_image_metabox_content', 'post', 'side' );
 }
+function help_featured_image_metabox_content() {
+    echo("La mejor proporción para la imagen destacada es la que mantiene una relación de 2'5 a 1. Normalmente <tt>1030x403</tt>.</p>");
 }
 
 /*