diff --git a/EBMLSchema.xsd b/EBMLSchema.xsd
index 475c049..9838920 100644
--- a/EBMLSchema.xsd
+++ b/EBMLSchema.xsd
@@ -139,7 +139,7 @@
     </xs:sequence>
     <xs:attribute name="label"/>
     <xs:attribute name="value" use="required"/>
-    <xs:attribute name="minver" default="1"/>
+    <xs:attribute name="minver"/>
   </xs:complexType>
 
   <xs:complexType name="documentationType" mixed="true">
diff --git a/specification.markdown b/specification.markdown
index e537966..079113b 100644
--- a/specification.markdown
+++ b/specification.markdown
@@ -1161,11 +1161,25 @@ Within an EBML Schema, the XPath of the `@value` attribute is
 `/EBMLSchema/element/restriction/enum/@minver`.
 
 The `minver` (minimum version) attribute stores a nonnegative integer that
-represents the first version of the docType to support the enum value.
+represents the first version of the docType to support the enum value. The value
+**MUST** be greater than or equal to the `minver` attribute value of the EBML Element it belongs to.
 
 The `minver` attribute is **OPTIONAL**. If the `minver`
-attribute is not present, then the enum value has a minimum version of
-"1".
+attribute is not present, then the enum value has the same value as the `minver` attribute of the
+EBML Element it belongs to.
+
+#### maxver
+
+Within an EBML Schema, the XPath of the `@value` attribute is
+`/EBMLSchema/element/restriction/enum/@maxver`.
+
+The `maxver` (maximum version) attribute stores a nonnegative integer that
+represents the last or most recent version of the docType to support
+the enum value. `maxver` **MUST** be greater than or equal to the `minver` attribute.
+
+The `maxver` attribute is **OPTIONAL**. If the `maxver` attribute is
+not present, then the enum value has a maximum version equal to the value
+stored in the `version` attribute of `<EBMLSchema>`.
 
 ### `<extension>` Element