diff --git a/identity_type/doc/Jamfile.v2 b/identity_type/doc/Jamfile.v2
index 0e1dd1b..07ca29e 100644
--- a/identity_type/doc/Jamfile.v2
+++ b/identity_type/doc/Jamfile.v2
@@ -41,4 +41,4 @@ boostbook pdf_doc : index
     ;
 
 install pdf_doc_install : pdf_doc : <location>. <name>identity_type.pdf <install-type>PDF ;
-
+explicit pdf_doc_install ;