diff --git a/grammars/isodoc.rnc b/grammars/isodoc.rnc
index 2b62063..94d5800 100644
--- a/grammars/isodoc.rnc
+++ b/grammars/isodoc.rnc
@@ -767,7 +767,7 @@ amend =
     attribute path_end { text }?,
     attribute title { text }?,
     BlockAttributes,
-    element location { locality* }?,
+    element location { (locality | localityStack)* }?,
     autonumber*,
     element description { BasicBlock* }?,
     element newcontent { 
diff --git a/grammars/isodoc.rng b/grammars/isodoc.rng
index 20149d5..1d328fb 100644
--- a/grammars/isodoc.rng
+++ b/grammars/isodoc.rng
@@ -2346,7 +2346,10 @@
       <optional>
         <element name="location">
           <zeroOrMore>
-            <ref name="locality"/>
+            <choice>
+              <ref name="locality"/>
+              <ref name="localityStack"/>
+            </choice>
           </zeroOrMore>
         </element>
       </optional>