diff --git a/src/festim/advection.py b/src/festim/advection.py
index 10081f823..ad22fa783 100644
--- a/src/festim/advection.py
+++ b/src/festim/advection.py
@@ -17,6 +17,8 @@ class AdvectionTerm:
         subdomain: the volume subdomain where the velocity is to be applied
         species: the species to which the velocity field is acting on
 
+    I want this in too
+
     attributes:
         velocity: the velocity field or function
         subdomain: the volume subdomain where the velocity is to be applied