diff --git a/library/HTMLPurifier/AttrDef/CSS.php b/library/HTMLPurifier/AttrDef/CSS.php
index 6a543d2f..c5314067 100644
--- a/library/HTMLPurifier/AttrDef/CSS.php
+++ b/library/HTMLPurifier/AttrDef/CSS.php
@@ -30,8 +30,8 @@ class HTMLPurifier_AttrDef_CSS extends HTMLPurifier_AttrDef
             list($property, $value) = explode(':', $declaration, 2);
             if (!isset($definition->info[$property])) continue;
             // inefficient call, since the validator will do this again
-            // inherit works for everything
             if (strtolower(trim($value)) !== 'inherit') {
+                // inherit works for everything (but only on the base property)
                 $result = $definition->info[$property]->validate(
                     $value, $config, $context );
             } else {
diff --git a/library/HTMLPurifier/AttrDef/Multiple.php b/library/HTMLPurifier/AttrDef/Multiple.php
index d4555e3c..ca053250 100644
--- a/library/HTMLPurifier/AttrDef/Multiple.php
+++ b/library/HTMLPurifier/AttrDef/Multiple.php
@@ -8,6 +8,10 @@ require_once 'HTMLPurifier/AttrDef.php';
  * Certain CSS properties such as border-width and margin allow multiple
  * lengths to be specified.  This class can take a vanilla border-width
  * definition and multiply it, usually into a max of four.
+ * 
+ * @note Even though the CSS specification isn't clear about it, inherit
+ *       can only be used alone: it will never manifest as part of a multi
+ *       shorthand declaration.  Thus, this class does not allow inherit.
  */
 class HTMLPurifier_AttrDef_Multiple extends HTMLPurifier_AttrDef
 {