diff --git a/doc/modules/dp-derivation.rst b/doc/modules/dp-derivation.rst
index b61e69f121f95407a172488fd10d80bca39d5c01..3e4d1b2d7c04896999b08dbdf9d0805ac39d56f9 100644
--- a/doc/modules/dp-derivation.rst
+++ b/doc/modules/dp-derivation.rst
@@ -348,6 +348,7 @@ The tied model
 ----------------
 
 The model then is
+
 .. math::
 
   \begin{array}{rcl}