diff --git a/.travis.yml b/.travis.yml
index 37e0eac..d26d34a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -147,7 +147,7 @@ matrix:
       osx_image: xcode10
       stage: coverage
       name: coverage, xcode10
-      addons: { homebrew: { packages: ["lcov"] } }
+      addons: { homebrew: { packages: ["lcov"], update: true } }
       script: ./scripts/upload_coverage.sh
 
 before_install:
diff --git a/README.md b/README.md
index 6dee0d1..6eb2572 100644
--- a/README.md
+++ b/README.md
@@ -142,10 +142,10 @@ namespace some_namespace
         (green = 0x00FF00)
         (blue = 0x0000FF)
         (white = red | green | blue))
-}
 
-// register traits in global namespace to generic access
-ENUM_HPP_REGISTER_TRAITS(color)
+    // register traits in enum namespace to generic access
+    ENUM_HPP_REGISTER_TRAITS(color)
+}
 
 int main() {
     using color = some_namespace::color;
@@ -176,9 +176,9 @@ namespace external_ns
         (a)
         (b)
         (c))
-}
 
-ENUM_HPP_REGISTER_TRAITS(external_ns::external_enum)
+    ENUM_HPP_REGISTER_TRAITS(external_enum)
+}
 
 int main() {
     using ee = external_ns::external_enum;
@@ -245,7 +245,7 @@ struct /*enum_name*/_traits {
 ### Generic functions
 
 ```cpp
-// should be in global namespace
+// should be in enum namespace
 ENUM_HPP_REGISTER_TRAITS(/*declared_enum_name*/)
 
 namespace enum_hpp
diff --git a/headers/enum.hpp/enum.hpp b/headers/enum.hpp/enum.hpp
index d9cd08e..b66f5d8 100644
--- a/headers/enum.hpp/enum.hpp
+++ b/headers/enum.hpp/enum.hpp
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <array>
+#include <utility>
 #include <optional>
 #include <stdexcept>
 #include <string_view>
@@ -27,10 +28,7 @@ namespace enum_hpp
 namespace enum_hpp
 {
     template < typename Enum >
-    struct traits;
-
-    template < typename Enum >
-    using traits_t = typename traits<Enum>::type;
+    using traits_t = decltype(enum_hpp_adl_find_registered_traits(std::declval<Enum>()));
 
     template < typename Enum >
     using underlying_type = typename traits_t<Enum>::underlying_type;
@@ -119,7 +117,7 @@ namespace enum_hpp
 namespace enum_hpp::detail
 {
     template < typename Enum >
-    struct ignore_assign {
+    struct ignore_assign final {
         Enum value;
 
         constexpr explicit ignore_assign(Enum value) noexcept
@@ -229,7 +227,7 @@ namespace enum_hpp::detail
 //
 
 #define ENUM_HPP_TRAITS_DECL(Enum, Fields)\
-    struct Enum##_traits {\
+    struct Enum##_traits final {\
     private:\
         enum enum_names_for_this_score_ {\
             ENUM_HPP_GENERATE_FIELDS(Fields)\
@@ -335,10 +333,7 @@ namespace enum_hpp::detail
 //
 
 #define ENUM_HPP_REGISTER_TRAITS(Enum)\
-    template <>\
-    struct enum_hpp::traits<Enum> {\
-        using type = Enum##_traits;\
-    };
+    [[maybe_unused]] Enum##_traits enum_hpp_adl_find_registered_traits(Enum) noexcept;
 
 // -----------------------------------------------------------------------------
 //
@@ -902,6 +897,7 @@ namespace enum_hpp::detail
 #define ENUM_HPP_PP_SEQ_SIZE_252(_) ENUM_HPP_PP_SEQ_SIZE_253
 #define ENUM_HPP_PP_SEQ_SIZE_253(_) ENUM_HPP_PP_SEQ_SIZE_254
 #define ENUM_HPP_PP_SEQ_SIZE_254(_) ENUM_HPP_PP_SEQ_SIZE_255
+#define ENUM_HPP_PP_SEQ_SIZE_255(_) ENUM_HPP_PP_SEQ_SIZE_256
 
 # define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_0 0
 # define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_1 1
@@ -1159,6 +1155,7 @@ namespace enum_hpp::detail
 # define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_253 253
 # define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_254 254
 # define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_255 255
+# define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_256 256
 
 //
 // ENUM_HPP_PP_SEQ_FOR_EACH
@@ -1422,3 +1419,4 @@ namespace enum_hpp::detail
 #define ENUM_HPP_PP_SEQ_FOR_EACH_253(m, d, i, s) m(d, i, ENUM_HPP_PP_SEQ_HEAD(s)) ENUM_HPP_PP_SEQ_FOR_EACH_252(m, d, ENUM_HPP_PP_INC(i), ENUM_HPP_PP_SEQ_TAIL(s))
 #define ENUM_HPP_PP_SEQ_FOR_EACH_254(m, d, i, s) m(d, i, ENUM_HPP_PP_SEQ_HEAD(s)) ENUM_HPP_PP_SEQ_FOR_EACH_253(m, d, ENUM_HPP_PP_INC(i), ENUM_HPP_PP_SEQ_TAIL(s))
 #define ENUM_HPP_PP_SEQ_FOR_EACH_255(m, d, i, s) m(d, i, ENUM_HPP_PP_SEQ_HEAD(s)) ENUM_HPP_PP_SEQ_FOR_EACH_254(m, d, ENUM_HPP_PP_INC(i), ENUM_HPP_PP_SEQ_TAIL(s))
+#define ENUM_HPP_PP_SEQ_FOR_EACH_256(m, d, i, s) m(d, i, ENUM_HPP_PP_SEQ_HEAD(s)) ENUM_HPP_PP_SEQ_FOR_EACH_255(m, d, ENUM_HPP_PP_INC(i), ENUM_HPP_PP_SEQ_TAIL(s))
diff --git a/untests/enum_examples.cpp b/untests/enum_examples.cpp
index 602d5e0..b328613 100644
--- a/untests/enum_examples.cpp
+++ b/untests/enum_examples.cpp
@@ -19,9 +19,9 @@ namespace
         (green = 0x00FF00)
         (blue = 0x0000FF)
         (white = red | green | blue))
-}
 
-ENUM_HPP_REGISTER_TRAITS(color)
+    ENUM_HPP_REGISTER_TRAITS(color)
+}
 
 TEST_CASE("examples") {
     SECTION("traits_using") {
diff --git a/untests/enum_tests.cpp b/untests/enum_tests.cpp
index e739a97..6bc8b03 100644
--- a/untests/enum_tests.cpp
+++ b/untests/enum_tests.cpp
@@ -54,6 +54,10 @@ namespace some_namespace
         (_201)(_202)(_203)(_204)(_205)(_206)(_207)(_208)(_209)(_210)(_211)(_212)(_213)(_214)(_215)(_216)(_217)(_218)(_219)(_220)
         (_221)(_222)(_223)(_224)(_225)(_226)(_227)(_228)(_229)(_230)(_231)(_232)(_233)(_234)(_235)(_236)(_237)(_238)(_239)(_240))
 
+    ENUM_HPP_REGISTER_TRAITS(some_namespace::color)
+    ENUM_HPP_REGISTER_TRAITS(some_namespace::numbers)
+    ENUM_HPP_REGISTER_TRAITS(some_namespace::render::mask)
+
     namespace exns
     {
         enum class external_enum : unsigned short {
@@ -66,13 +70,11 @@ namespace some_namespace
             (a)
             (b)
             (c))
+
+        ENUM_HPP_REGISTER_TRAITS(external_enum)
     }
 }
 
-ENUM_HPP_REGISTER_TRAITS(some_namespace::color)
-ENUM_HPP_REGISTER_TRAITS(some_namespace::numbers)
-ENUM_HPP_REGISTER_TRAITS(some_namespace::exns::external_enum)
-
 TEST_CASE("enum") {
     namespace sn = some_namespace;
 
@@ -148,6 +150,11 @@ TEST_CASE("enum") {
             STATIC_REQUIRE(enum_hpp::traits_t<sn::numbers>::size == 241u);
             STATIC_REQUIRE(std::size(enum_hpp::names<sn::numbers>()) == 241u);
             STATIC_REQUIRE(std::size(enum_hpp::values<sn::numbers>()) == 241u);
+
+            STATIC_REQUIRE(enum_hpp::size<sn::render::mask>() == 4u);
+            STATIC_REQUIRE(enum_hpp::traits_t<sn::render::mask>::size == 4u);
+            STATIC_REQUIRE(std::size(enum_hpp::names<sn::render::mask>()) == 4u);
+            STATIC_REQUIRE(std::size(enum_hpp::values<sn::render::mask>()) == 4u);
         }
     }