diff --git a/lib/Gedmo/Sluggable/Sluggable.php b/lib/Gedmo/Sluggable/Sluggable.php
index 25c925ff5f..fab06ba7d6 100644
--- a/lib/Gedmo/Sluggable/Sluggable.php
+++ b/lib/Gedmo/Sluggable/Sluggable.php
@@ -25,6 +25,7 @@ interface Sluggable
      * available options:
      *         updatable (optional, default=true) - true to update the slug on sluggable field changes, false - otherwise
      *         unique (optional, default=true) - true if slug should be unique and if identical it will be prefixed, false - otherwise
+     *         unique_base (optional, default="") - used in conjunction with unique. The name of the entity property that should be used as a key when doing a uniqueness check
      *         separator (optional, default="-") - separator which will separate words in slug
      *         prefix (optional, default="") - suffix which will be added to the generated slug
      *         suffix (optional, default="") - prefix which will be added to the generated slug
diff --git a/schemas/orm/doctrine-extensions-mapping-2-2.xsd b/schemas/orm/doctrine-extensions-mapping-2-2.xsd
index 7722e0db32..f6ac4e43f5 100644
--- a/schemas/orm/doctrine-extensions-mapping-2-2.xsd
+++ b/schemas/orm/doctrine-extensions-mapping-2-2.xsd
@@ -78,6 +78,7 @@ people to push their own additional attributes/elements into the same field elem
     </xs:sequence>
     <xs:attribute name="fields" type="xs:string" use="required"/>
     <xs:attribute name="unique" type="xs:boolean" use="optional" />
+    <xs:attribute name="unique_base" type="xs:string" use="optional" />
     <xs:attribute name="updatable" type="xs:boolean" use="optional" />
     <xs:attribute name="separator" type="xs:string" use="optional" />
     <xs:attribute name="style" type="gedmo:slug-style" use="optional" />