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SciML · Dec 2, 2023 · 4bdc92c · 4bdc92c
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diff --git a/docs/src/catalyst_functionality/dsl_description.md b/docs/src/catalyst_functionality/dsl_description.md
@@ -668,7 +668,6 @@ nothing #hide
 It is possible to add several equations to the model. In this case, each have a separate line. E.g. to keep track of a supply of nutrition ($N$) in the growth media, we can use:
 ```@example eqs1
 rn = @reaction_network begin
-  @parameters k
   @equations begin
     D(V) ~ G
     D(N) ~ -G

diff --git a/test/dsl/dsl_options.jl b/test/dsl/dsl_options.jl
@@ -636,6 +636,12 @@ let
         (p,d), 0 <--> S
     end
 
+    # Differential with respect to a species.
+    @test_throws Exception @eval @reaction_network begin
+        @equations D(S) ~ 1 - S
+        (p,d), 0 <--> S
+    end
+
     # System with derivatives with respect to several independent variables.
     @test_throws Exception @eval @reaction_network begin
         @ivs s t