diff --git a/Project.toml b/Project.toml
index c6b05d6..656e37b 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 = "1.0.0"
+version = "1.1.0"
 
 [deps]
 ScientificTypes = "321657f4-b219-11e9-178b-2701a2544e81"
diff --git a/src/StatisticalTraits.jl b/src/StatisticalTraits.jl
index cb22274..b5ea520 100644
--- a/src/StatisticalTraits.jl
+++ b/src/StatisticalTraits.jl
@@ -33,7 +33,8 @@ const TRAITS = [
     :is_feature_dependent,
     :distribution_type,
     :iteration_parameter,
-    :supports_training_losses
+    :supports_training_losses,
+    :deep_properties
 ]
 
 
@@ -168,6 +169,7 @@ reports_each_observation(::Type) = false
 distribution_type(::Type)        = missing
 iteration_parameter(::Type)      = nothing
 supports_training_losses(::Type) = false
+deep_properties(::Type) = ()
 
 # Returns a tuple, with one entry per field of `T` (the type of some
 # statistical model, for example). Each entry is `nothing` or defines