diff --git a/docs/src/model_simulation/simulation_structure_interfacing.md b/docs/src/model_simulation/simulation_structure_interfacing.md
index 0d557be2f0..4752d9cbbb 100644
--- a/docs/src/model_simulation/simulation_structure_interfacing.md
+++ b/docs/src/model_simulation/simulation_structure_interfacing.md
@@ -150,7 +150,7 @@ get_S(oprob)
 ## [Interfacing using symbolic representations](@id simulation_structure_interfacing_symbolic_representation)
 When e.g. [programmatic modelling is used](@ref programmatic_CRN_construction), species and parameters can be represented as *symbolic variables*. These can be used to index a problem, just like symbol-based representations can. Here we create a simple [two-state model](@ref basic_CRN_library_two_states) programmatically, and use its symbolic variables to check, and update, an initial condition:
 ```@example structure_indexing_symbolic_variables
-using Catalyst
+using Catalyst, OrdinaryDiffEq
 t = default_t()
 @species X1(t) X2(t)
 @parameters k1 k2
@@ -183,4 +183,4 @@ oprob[two_state_model.X1 + two_state_model.X2]
 This can be used to form symbolic expressions using model quantities when a model has been created using the DSL (as an alternative to @unpack). Alternatively, [creating an observable](@ref dsl_advanced_options_observables), and then interface using its `Symbol` representation, is also possible.
 
 !!! warn
-    With interfacing with a simulating structure using symbolic variables stored in a `ReactionSystem` model, ensure that the model is complete.
\ No newline at end of file
+    With interfacing with a simulating structure using symbolic variables stored in a `ReactionSystem` model, ensure that the model is complete.