diff --git a/lib/AbstractSanitizer.php b/lib/AbstractSanitizer.php
index c4b26e0..607d3e0 100644
--- a/lib/AbstractSanitizer.php
+++ b/lib/AbstractSanitizer.php
@@ -21,11 +21,11 @@ abstract class AbstractSanitizer {
     /** @var array $config The parsed configuration, as used for processing */
     protected $config;
 
-    /** Initializes a sanitizer with the provided configuration, or the default configuration
+    /** Initializes a sanitizer with the provided configuration, or the default configuration if no configuration is provided
      * 
      * The configuration array may contain any of the following keys:
      * 
-     * - `allowElements`: an indexed array of elements to allow. Elements not in this list will be blocked as if they were included in the `blockElements` list
+     * - `allowElements`: an indexed array of elements to retain in the tree. Elements not in this list will be blocked as if they were included in the `blockElements` list
      * - `blockElements`: an indexed array of elements to remove from the tree while retaining their children
      * - `dropElements`: an indexed array of elements to remove from the tree along with their children
      * - `allowAttributes`: an indexed array of attributes to allow on certain elements. Attributes not in this list will be dropped
@@ -45,7 +45,7 @@ abstract class AbstractSanitizer {
      * 
      * - `name`: The localName of the attribute
      * - `namespace`: The namespaceURI of the attribute. If omitted the null namespace is assumed
-     * - `elements`: An indexed array of elements on which to allow the attribute, in the same format as other element lists. The string `"*"` may also be supplied instead of an array to mean all elements
+     * - `elements`: An indexed array of elements on which to allow the attribute, in the same format as other element lists. The string `"*"` may be supplied instead of an array to mean all elements
      * 
      * @param array $config A configuration to use instead of the default one
      */