diff --git a/lib/config.php b/lib/config.php
index 317b4bd..14b6e55 100644
--- a/lib/config.php
+++ b/lib/config.php
@@ -13,7 +13,7 @@ add_theme_support('jquery-cdn');            // Enable to load jQuery from the Go
  * Configuration values
  */
 define('GOOGLE_ANALYTICS_ID', ''); // UA-XXXXX-Y
-define('POST_EXCERPT_LENGTH', 40); // words
+define('POST_EXCERPT_LENGTH', 40); // length in words for excerpt_length filter (ref: http://codex.wordpress.org/Plugin_API/Filter_Reference/excerpt_length)
 
 /**
  * .main classes