From c8d6ef4f5b98dda973e6bd813db504171ffc2abc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beno=C3=AEt=20Legat?= <benoit.legat@gmail.com>
Date: Sat, 5 Jan 2019 22:33:05 +0100
Subject: [PATCH] Add comment explaining design

---
 test/print.jl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/print.jl b/test/print.jl
index 666bb0b4882..c48d033802e 100644
--- a/test/print.jl
+++ b/test/print.jl
@@ -475,6 +475,8 @@ end
 
 # Test printing of models of type `ModelType` for which the model is stored in
 # its JuMP form, e.g., as `AbstractVariable`s and `AbstractConstraint`s.
+# This is used by `JuMPExtension` but can also be used by external packages such
+# as `StructJuMP`, see https://github.com/JuliaOpt/JuMP.jl/issues/1711
 function model_extension_printing_test(ModelType::Type{<:JuMP.AbstractModel})
     @testset "Model" begin
         repl(s) = JuMP.math_symbol(REPLMode, s)