diff --git a/schema/legacy/eoa-tei-strict.rnc b/schema/legacy/eoa-tei-strict.rnc
index 9dcf597..a38f63b 100644
--- a/schema/legacy/eoa-tei-strict.rnc
+++ b/schema/legacy/eoa-tei-strict.rnc
@@ -313,7 +313,7 @@ subsubsection =
       eoaelement*
    }
 
-head = element head { (text | markup | inline_formula | index | indexanchor | ref )+ }
+head = element head { (text | markup | inline_formula | index | indexanchor | ref | foreign )+ }
 
 floathead =
    element head {