diff --git a/doc/supply_demand.rst b/doc/supply_demand.rst
index 2cb30795..4f74f58c 100644
--- a/doc/supply_demand.rst
+++ b/doc/supply_demand.rst
@@ -407,4 +407,4 @@ plants, and directly from the air (DAC).
 Carbon dioxide can be used as an input for methanation and
 Fischer-Tropsch fuels, or it can be sequestered underground.
 
-test <a href="doc/supply_demand.rst#L397">
+[test] <a href="doc/supply_demand.rst#L397">