diff --git a/doc/manual/Makefile.am b/doc/manual/Makefile.am
index 7c788727..67fa3da6 100644
--- a/doc/manual/Makefile.am
+++ b/doc/manual/Makefile.am
@@ -1,4 +1,4 @@
-DOCBOOK_FILES = installation.xml introduction.xml manual.xml projects.xml
+DOCBOOK_FILES = installation.xml introduction.xml manual.xml projects.xml hacking.xml
 
 EXTRA_DIST = $(DOCBOOK_FILES)