diff --git a/doc/howtos/backend.rst b/doc/howtos/backend.rst
index 0b7a496c795..45ac26d9383 100644
--- a/doc/howtos/backend.rst
+++ b/doc/howtos/backend.rst
@@ -993,7 +993,8 @@ behavior:
     as a string of the form ``yyyy-MM-dd``).
 
     ``{$name}`` can be ``bf`` (``font-weight: bold``), ``it``
-    (``font-style: italic``), or any bootstrap contextual color (``danger``,
+    (``font-style: italic``), or any `bootstrap contextual color
+    <http://getbootstrap.com/components/#available-variations>`_ (``danger``,
     ``info``, ``muted``, ``primary``, ``success`` or ``warning``).
 
     .. code-block:: xml
diff --git a/doc/reference/views.rst b/doc/reference/views.rst
index e26f1810ce8..8c2dea837e5 100644
--- a/doc/reference/views.rst
+++ b/doc/reference/views.rst
@@ -158,7 +158,8 @@ root can have the following attributes:
     as a string of the form ``yyyy-MM-dd``).
 
     ``{$name}`` can be ``bf`` (``font-weight: bold``), ``it``
-    (``font-style: italic``), or any bootstrap contextual color (``danger``,
+    (``font-style: italic``), or any `bootstrap contextual color
+    <http://getbootstrap.com/components/#available-variations>`_ (``danger``,
     ``info``, ``muted``, ``primary``, ``success`` or ``warning``).
 ``create``, ``edit``, ``delete``
     allows *dis*\ abling the corresponding action in the view by setting the