diff --git a/ext/DynamicPPLEnzymeCoreExt.jl b/ext/DynamicPPLEnzymeCoreExt.jl
index e3272487b..20e325fcd 100644
--- a/ext/DynamicPPLEnzymeCoreExt.jl
+++ b/ext/DynamicPPLEnzymeCoreExt.jl
@@ -10,6 +10,7 @@ end
 
 @inline EnzymeCore.EnzymeRules.inactive_type(::Type{<:DynamicPPL.SamplingContext}) = true
 
+# Mark istrans as having 0 derivative
 @inline EnzymeCore.EnzymeRules.inactive_noinl(::typeof(DynamicPPL.istrans), args...) = nothing
 
 end