diff --git a/.gitattributes b/.gitattributes
index 0063250851b..efc32858f4f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2637,6 +2637,7 @@ Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/icons/wireframe.png -
Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/icons/wireframeOff.png -text
Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about.html -text
Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about_CGAL.html -text
+Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about_help.html -text
Periodic_3_triangulation_3/doc_tex/Periodic_3_triangulation_3/offsets.eps -text
Periodic_3_triangulation_3/doc_tex/Periodic_3_triangulation_3/offsets.gif -text
Periodic_3_triangulation_3/doc_tex/Periodic_3_triangulation_3/offsets.pdf -text
diff --git a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about_help.html b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about_help.html
new file mode 100644
index 00000000000..ef82628158b
--- /dev/null
+++ b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/resources/about_help.html
@@ -0,0 +1,9 @@
+
+
+ Demo manual
+ Please find the manual in documentation/index.html in the demo
+ directory.
+ Copyright ©2008-2009
+ INRIA Sophia Antipolis - Mediterranee
+
+