diff --git a/docs/reference/systems.rst b/docs/reference/systems.rst
index ff838d72..77ffb0cc 100644
--- a/docs/reference/systems.rst
+++ b/docs/reference/systems.rst
@@ -8,8 +8,7 @@ Systems
 SI
 --
 
-.. 
-   doxygennamespace:: units::si
+.. doxygennamespace:: units::si
     :members:
     :undoc-members:
     :outline: