diff --git a/input/PhdImplementationGuide.xml b/input/PhdImplementationGuide.xml
index edc66df..487ad66 100644
--- a/input/PhdImplementationGuide.xml
+++ b/input/PhdImplementationGuide.xml
@@ -48,7 +48,7 @@ In this example there are only xml structure definitions, value sets, code syste