diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
new file mode 100644
index 000000000..73cf55c3b
--- /dev/null
+++ b/CONTRIBUTORS.md
@@ -0,0 +1,13 @@
+## Core developer
+
+- Yacine Petitprez (anykeyh@gmail.com)
+
+## Thanks to
+
+- 007lva (007.lva@gmail.com)
+- Jeremy Woertink (jeremywoertink@gmail.com)
+- Matthias Zauner (sagishi@zive.at)
+- Russ Smith (russ@bashme.org)
+- Troy A. Sornson (troyasornson37@gmail.com)
+
+For contributing to a better ~world~ ORM.
\ No newline at end of file
diff --git a/README.md b/README.md
index bbf929c45..94c33569e 100644
--- a/README.md
+++ b/README.md
@@ -61,8 +61,7 @@ You don't want to use Clear if:
 - [Source Code](https://github.com/anykeyh/clear)
 - [A simple example is available here](https://github.com/anykeyh/clear/blob/master/sample/wiki/getting_started.cr)
 - [Changelog](https://github.com/anykeyh/clear/blob/master/CHANGELOG.md)
-
-
+- [Credits](https://github.com/anykeyh/clear/tree/master/CONTRIBUTORS.md)
 
 ## Getting started
 
diff --git a/manual/README.md b/manual/README.md
index e51f0608d..0b28bd3c0 100644
--- a/manual/README.md
+++ b/manual/README.md
@@ -22,6 +22,7 @@ If you're in hurry and already at ease with Active Record pattern, a simple stan
 - [Polymorphism](model/Polymorphism.md)
 - [Different database connections](model/MultiConnection.md)
 - [Column data type management](model/TypeConversion.md)
+- [SQL Debugging Info](model/DebuggingInfo.md)
 
 ## Querying
 
diff --git a/manual/model/DebuggingInfo.md b/manual/model/DebuggingInfo.md
new file mode 100644
index 000000000..2cbc65d9a
--- /dev/null
+++ b/manual/model/DebuggingInfo.md
@@ -0,0 +1,36 @@
+#### Inspection
+
+We've reimplemented `inspect` on models, to offer debugging insights:
+
+```text
+  pp post # => #<Post:0x10c5f6720
+              @attributes={},
+              @cache=
+               #<Clear::Model::QueryCache:0x10c6e8100
+                @cache={},
+                @cache_activation=Set{}>,
+              @content_column=
+               "...",
+              @errors=[],
+              @id_column=38,
+              @persisted=true,
+              @published_column=true,
+              @read_only=false,
+              @title_column="Lorem ipsum torquent inceptos"*,
+              @user_id_column=5>
+```
+
+In this case, the `*` means a column is changed and the object is dirty and must
+be saved on the database.
+
+#### SQL Logging
+
+Clear is offering SQL logging tools, with SQL syntax colorizing in your terminal.
+For activation, simply setup the logger to `DEBUG` level
+
+```
+Clear.logger.level = ::Logger::DEBUG
+```
+
+Also, Clear will log all query made, and when exception will show you the last query
+in your terminal.
\ No newline at end of file
diff --git a/src/clear/extensions/enum/enum.cr b/src/clear/extensions/enum/enum.cr
index c413ce231..e540d6573 100644
--- a/src/clear/extensions/enum/enum.cr
+++ b/src/clear/extensions/enum/enum.cr
@@ -53,7 +53,7 @@ module Clear
   # ```
   macro enum(name, *values)
     struct {{name.id}} < ::Clear::Enum
-      AUTHORIZED_VALUES = {} of String => {{name.id}}
+      private AUTHORIZED_VALUES = {} of String => {{name.id}}
 
       {% for i in values %}
         {{i.camelcase.id}} = {{name.id}}.new("{{i.id}}")
@@ -75,6 +75,10 @@ module Clear
         AUTHORIZED_VALUES.values
       end
 
+      def self.valid?(x)
+        AUTHORIZED_VALUES[x]?
+      end
+
       macro finished
         module ::Clear::Model::Converter::\{{@type}}Converter
           def self.to_column(x) : ::\{{@type}}?