diff --git a/doc/cla/individual/piemar1.md b/doc/cla/individual/piemar1.md
new file mode 100644
index 00000000000..06c857427ca
--- /dev/null
+++ b/doc/cla/individual/piemar1.md
@@ -0,0 +1,9 @@
+Poland, 2017-06-25
+
+I hereby agree to the terms of the Odoo Individual Contributor License Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this declaration.
+
+Signed,
+
+Marcin PieczyĆski marcin-pieczynski@wp.pl https://github.com/piemar1
diff --git a/doc/howtos/backend.rst b/doc/howtos/backend.rst
index 924dfbfa1bc..575cb23e3ae 100644
--- a/doc/howtos/backend.rst
+++ b/doc/howtos/backend.rst
@@ -1120,6 +1120,11 @@ default and behave as booleans (they can only be enabled by default).
Gantt
-----
+.. warning::
+
+ The gantt view requires the web_gantt module which is present in
+ :ref:`the enterprise edition ` version.
+
Horizontal bar charts typically used to show project planning and advancement,
their root element is ````.