diff --git a/source/ch3_javadatatypes.ptx b/source/ch3_javadatatypes.ptx
index a08b796..d65600d 100644
--- a/source/ch3_javadatatypes.ptx
+++ b/source/ch3_javadatatypes.ptx
@@ -6,7 +6,7 @@
 
     <section xml:id="numeric">
         <title>Numeric</title>
-
+        <introduction>
             <p>
                 One of the great things about Python is that all of the basic data types are objects.
                 Integers are objects, floating point numbers are objects, lists are objects, everything.
@@ -156,7 +156,7 @@ public class TempConv {
 
                 </ul>
             </p>
-
+        </introduction>
 
         <subsection>
             <title>Import</title>