diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 04b69f8c69..2ca7d7f898 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -141,8 +141,9 @@ function request_var($var_name, $default, $multibyte = false, $cookie = false)
 *
 * @param string $config_name   The configuration option's name
 * @param string $config_value  New configuration value
-* @param bool   $is_dynamic    Whether this variable should be cached or if it
-*                              changes too frequently to be efficiently cached.
+* @param bool   $is_dynamic    Whether this variable should be cached (false) or
+*                              if it changes too frequently (true) to be
+*                              efficiently cached.
 *
 * @return null
 */
@@ -177,8 +178,9 @@ function set_config($config_name, $config_value, $is_dynamic = false)
 *
 * @param string $config_name   The configuration option's name
 * @param int    $increment     Amount to increment by
-* @param bool   $is_dynamic    Whether this variable should be cached or if it
-*                              changes too frequently to be efficiently cached.
+* @param bool   $is_dynamic    Whether this variable should be cached (false) or
+*                              if it changes too frequently (true) to be
+*                              efficiently cached.
 *
 * @return null
 */