diff --git a/Project.toml b/Project.toml
index 5f05d50..afebf49 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "StatisticalTraits"
 uuid = "64bff920-2084-43da-a3e6-9bb72801c0c9"
 authors = ["Anthony D. Blaom <anthony.blaom@gmail.com>"]
-version = "3.2.0"
+version = "3.4.0"
 
 [deps]
 ScientificTypesBase = "30f210dd-8aff-4c5f-94ba-8e64358c1161"
diff --git a/src/StatisticalTraits.jl b/src/StatisticalTraits.jl
index f6df0e7..2f0676d 100644
--- a/src/StatisticalTraits.jl
+++ b/src/StatisticalTraits.jl
@@ -42,6 +42,7 @@ const TRAITS = [
     :supports_training_losses,
     :deep_properties,
     :reporting_operations,
+    :constructor,
 ]
 
 
@@ -172,6 +173,7 @@ abstract_type(::Type)   = Any
 is_wrapper(::Type)      = false     # or `true`
 supports_online(::Type) = false     # or `true`
 docstring(M::Type)      = string(M) # some `String`
+docstring(Contructor::Function) = Base.Docs.doc(Constructor) |> string
 is_supervised(::Type)   = false     # or `true`
 human_name(M::Type)     = snakecase(name(M), delim=' ') # `name` defined below
 orientation(::Type)     = :loss  # or `:score`, `:other`
@@ -184,6 +186,7 @@ iteration_parameter(::Type)      = nothing
 supports_training_losses(::Type) = false
 deep_properties(::Type) = ()
 reporting_operations(::Type) = ()
+constructor(::Type) = nothing
 
 # Returns a tuple, with one entry per field of `T` (the type of some
 # statistical model, for example). Each entry is `nothing` or defines