diff --git a/libraries/pybamm-developer/01_ode.md b/libraries/pybamm-developer/01_ode.md
index a541c8e0..2c256f7e 100644
--- a/libraries/pybamm-developer/01_ode.md
+++ b/libraries/pybamm-developer/01_ode.md
@@ -46,6 +46,7 @@ U_n = pybamm.FunctionParameter("Negative electrode OCV", {"x_n": x_n})
 Q_n = pybamm.Parameter("Negative electrode capacity [A.h]")
 Q_p = pybamm.Parameter("Positive electrode capacity [A.h]")
 R = pybamm.Parameter("Electrode resistance [Ohm]")
+```
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