diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6566c5af..ecbaced9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -303,6 +303,8 @@ list (
     json/schema/base.hpp
     json/schema/combine.cpp
     json/schema/combine.hpp
+    json/schema/enum.cpp
+    json/schema/enum.hpp
     json/schema/except.hpp
     json/schema/introspection.hpp
     json/schema/length.cpp
diff --git a/json/schema.cpp b/json/schema.cpp
index af4038be..b65bb7f2 100644
--- a/json/schema.cpp
+++ b/json/schema.cpp
@@ -11,7 +11,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright 2015-2017 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
  */
 
 #include "schema.hpp"
diff --git a/json/schema/base.cpp b/json/schema/base.cpp
index 41377731..acd39835 100644
--- a/json/schema/base.cpp
+++ b/json/schema/base.cpp
@@ -20,6 +20,7 @@
 #include "length.hpp"
 #include "inequality.hpp"
 #include "properties.hpp"
+#include "enum.hpp"
 
 using util::json::schema::constraint::base;
 
@@ -34,6 +35,7 @@ base::instantiate (std::string const &name, ::json::tree::node const &def)
     if (name == "minimum")    return std::make_unique<minimum> (def);
     if (name == "maximum")    return std::make_unique<maximum> (def);
     if (name == "properties") return std::make_unique<properties> (def);
+    if (name == "enum")       return std::make_unique<enumeration> (def);
 
     throw unknown_constraint (name);
 }
diff --git a/json/schema/enum.cpp b/json/schema/enum.cpp
new file mode 100644
index 00000000..22a1b896
--- /dev/null
+++ b/json/schema/enum.cpp
@@ -0,0 +1,39 @@
+#include "enum.hpp"
+
+#include "../tree.hpp"
+
+using util::json::schema::constraint::enumeration;
+
+
+///////////////////////////////////////////////////////////////////////////////
+enumeration::enumeration (::json::tree::node const &def)
+{
+    for (auto const &i: def.as_array ())
+        m_values.push_back (i.clone ());
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+enumeration::output_iterator
+enumeration::validate (util::json::schema::constraint::base::output_iterator res,
+                       ::json::tree::node &target) const noexcept
+{
+    for (auto const &i: m_values)
+        if (target == *i)
+            return res;
+
+    return *res++ = { .rule = *this, .target = target };
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+std::ostream&
+enumeration::describe (std::ostream &os) const
+{
+    os << "{ enumeration: [ ";
+
+    for (auto const &i: m_values)
+        os << *i << ", ";
+
+    return os << " ] }";
+}
diff --git a/json/schema/enum.hpp b/json/schema/enum.hpp
new file mode 100644
index 00000000..98794db5
--- /dev/null
+++ b/json/schema/enum.hpp
@@ -0,0 +1,38 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2018 Danny Robson <danny@nerdcruft.net>
+ */
+
+#pragma once
+
+#include "base.hpp"
+
+#include "../fwd.hpp"
+
+#include <memory>
+
+namespace util::json::schema::constraint {
+    class enumeration final : public base {
+    public:
+        enumeration (::json::tree::node const &def);
+
+        virtual ~enumeration () = default;
+
+        output_iterator validate (output_iterator res, ::json::tree::node &) const noexcept override;
+        std::ostream& describe (std::ostream&) const override;
+
+    private:
+        std::vector<std::unique_ptr<::json::tree::node>> m_values;
+    };
+}
\ No newline at end of file
diff --git a/test/json/schema/validation/7000_enum/bad/0000_integer.json b/test/json/schema/validation/7000_enum/bad/0000_integer.json
new file mode 100644
index 00000000..d00491fd
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/0000_integer.json
@@ -0,0 +1 @@
+1
diff --git a/test/json/schema/validation/7000_enum/bad/1000_true.json b/test/json/schema/validation/7000_enum/bad/1000_true.json
new file mode 100644
index 00000000..27ba77dd
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/1000_true.json
@@ -0,0 +1 @@
+true
diff --git a/test/json/schema/validation/7000_enum/bad/2000_string.json b/test/json/schema/validation/7000_enum/bad/2000_string.json
new file mode 100644
index 00000000..196e5879
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/2000_string.json
@@ -0,0 +1 @@
+"bar"
diff --git a/test/json/schema/validation/7000_enum/bad/3000_empty_object.json b/test/json/schema/validation/7000_enum/bad/3000_empty_object.json
new file mode 100644
index 00000000..ffcd4415
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/3000_empty_object.json
@@ -0,0 +1 @@
+{ }
diff --git a/test/json/schema/validation/7000_enum/bad/3100_single_entry_object.json b/test/json/schema/validation/7000_enum/bad/3100_single_entry_object.json
new file mode 100644
index 00000000..810c6f71
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/3100_single_entry_object.json
@@ -0,0 +1 @@
+{ "val": "key" }
diff --git a/test/json/schema/validation/7000_enum/bad/3101_multi_entry_object.json b/test/json/schema/validation/7000_enum/bad/3101_multi_entry_object.json
new file mode 100644
index 00000000..71e61e3e
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/3101_multi_entry_object.json
@@ -0,0 +1 @@
+{ "key": "val", "additional": "error" }
diff --git a/test/json/schema/validation/7000_enum/bad/4000_array.json b/test/json/schema/validation/7000_enum/bad/4000_array.json
new file mode 100644
index 00000000..58c70395
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/4000_array.json
@@ -0,0 +1 @@
+[ 1.1 ]
diff --git a/test/json/schema/validation/7000_enum/bad/5000_none.json b/test/json/schema/validation/7000_enum/bad/5000_none.json
new file mode 100644
index 00000000..68787000
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/bad/5000_none.json
@@ -0,0 +1 @@
+null 
diff --git a/test/json/schema/validation/7000_enum/good/0000_number.input.json b/test/json/schema/validation/7000_enum/good/0000_number.input.json
new file mode 100644
index 00000000..9459d4ba
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/good/0000_number.input.json
@@ -0,0 +1 @@
+1.1
diff --git a/test/json/schema/validation/7000_enum/good/1000_boolean.input.json b/test/json/schema/validation/7000_enum/good/1000_boolean.input.json
new file mode 100644
index 00000000..c508d536
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/good/1000_boolean.input.json
@@ -0,0 +1 @@
+false
diff --git a/test/json/schema/validation/7000_enum/good/2000_string.input.json b/test/json/schema/validation/7000_enum/good/2000_string.input.json
new file mode 100644
index 00000000..810c96ee
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/good/2000_string.input.json
@@ -0,0 +1 @@
+"foo"
diff --git a/test/json/schema/validation/7000_enum/good/3000_object.input.json b/test/json/schema/validation/7000_enum/good/3000_object.input.json
new file mode 100644
index 00000000..d3a16359
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/good/3000_object.input.json
@@ -0,0 +1 @@
+{ "key": "val" }
diff --git a/test/json/schema/validation/7000_enum/good/4000_array.input.json b/test/json/schema/validation/7000_enum/good/4000_array.input.json
new file mode 100644
index 00000000..fe51488c
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/good/4000_array.input.json
@@ -0,0 +1 @@
+[]
diff --git a/test/json/schema/validation/7000_enum/schema.json b/test/json/schema/validation/7000_enum/schema.json
new file mode 100644
index 00000000..8b06c85d
--- /dev/null
+++ b/test/json/schema/validation/7000_enum/schema.json
@@ -0,0 +1 @@
+{ "enum": [ 1.1, false, "foo", { "key": "val" }, [] ] }