diff --git a/src/sum_type.jl b/src/sum_type.jl
index c72e948..bf85823 100644
--- a/src/sum_type.jl
+++ b/src/sum_type.jl
@@ -228,6 +228,7 @@ function generate_sum_struct_expr(T, T_abstract, T_name, T_params, T_params_cons
 
     sum_struct_def = Expr(:struct, false, Expr(:(<:), T_full, T_abstract),
                           Expr(:block, :(data :: ($Union){$(store_types...)}),  ))
+    sum_struct_def = :(Base.@__doc__ $sum_struct_def)
     
     enumerate_constructors = collect(enumerate(constructors))
 
diff --git a/test/runtests.jl b/test/runtests.jl
index f96174f..b219ef4 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -2,6 +2,10 @@ using Test, SumTypes
 
 
 abstract type AbstractFoo end
+
+"""
+This is a Foo.
+"""
 @sum_type Foo <: AbstractFoo begin
     Bar(::Int)
     Baz(x)
@@ -33,7 +37,8 @@ end
     @test Bar(1) isa Foo
     @test Bar(1) isa AbstractFoo
     @test_throws MethodError Foo(1)
-
+    @test string(@doc Foo) == "This is a Foo.\n"
+    
     function either_test(x::Either)
         let x::Either{Int, Int} = x
             @cases x begin