diff --git a/convict/convict-tests.ts b/convict/convict-tests.ts
index 6cde3b38c..3bd64c592 100644
--- a/convict/convict-tests.ts
+++ b/convict/convict-tests.ts
@@ -6,6 +6,42 @@ import validator = require('validator');
 
 // define a schema
 
+// straight from the convict tests
+const format : convict.Format = {
+  name: 'float-percent',
+  validate: function(val) {
+    if (val !== 0 && (!val || val > 1 || val < 0)) {
+      throw new Error('must be a float between 0 and 1, inclusive');
+    }
+  },
+  coerce: function(val) {
+    return +(<string> val);
+  }
+};
+
+
+
+
+convict.addFormat(format);
+convict.addFormats({
+      prime: {
+        validate: function(val) {
+          function isPrime(n: number) {
+            if (n <= 1) return false; // zero and one are not prime
+            for (var i=2; i*i <= n; i++) {
+              if (n % i === 0) return false;
+            }
+            return true;
+          }
+          if (!isPrime(val)) throw new Error('must be a prime number');
+        },
+        coerce: function(val) {
+          return parseInt(val, 10);
+        }
+      }
+    });
+
+
 var conf = convict({
   env: {
     doc: 'The applicaton environment.',
@@ -46,7 +82,15 @@ var conf = convict({
       env: 'PORT',
       arg: 'port',
     }
-  }
+  },
+  primeNumber: {
+    format: 'prime',
+    default: 17
+  },
+  percentNumber: {
+    format: 'float-percent',
+    default: 0.5
+  },
 
 });
 
@@ -72,4 +116,10 @@ if (conf.has('key')) {
     }
   });
 }
+
+conf.getSchema();
+conf.getProperties();
+conf.getSchemaString();
+conf.toString();
+
 // vim:et:sw=2:ts=2
diff --git a/convict/convict.d.ts b/convict/convict.d.ts
index 74ed10038..14ecae8f8 100644
--- a/convict/convict.d.ts
+++ b/convict/convict.d.ts
@@ -4,30 +4,74 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module "convict" {
-	function convict(schema: convict.Schema): convict.Config;
+    module convict {
 
-	module convict {
-		interface Schema {
-			[name: string]: convict.Schema | {
-				default: any;
-				doc?: string;
-				format?: any;
-				env?: string;
-				arg?: string;
-			};
-		}
+        interface Format {
+            name?: string;
+            validate?: (val: any) => void;
+            coerce?: (val: any) => any;
+        }
 
-		interface Config {
-			get(name: string): any;
-			default(name: string): any;
-			has(name: string): boolean;
-			set(name: string, value: any): void;
-			load(conf: Object): void;
-			loadFile(file: string): void;
-			loadFile(files: string[]): void;
-			validate(): void;
-		}
-	}
+        interface Schema {
+            [name: string]: convict.Schema | {
+                default: any;
+                doc?: string;
+                /**
+                 * From the implementation:
+                 *
+                 *  format can be a:
+                 *   - predefine type, as seen below
+                 *   - an array of enumerated values, e.g. ["production", "development", "testing"]
+                 *   - built-in JavaScript type, i.e. Object, Array, String, Number, Boolean
+                 *   - or if omitted, the Object.prototype.toString.call of the default value
+                 * 
+                 * The docs also state that any function that validates is ok too
+                 */
+                format?: string | Array<any> | Function;
+                env?: string;
+                arg?: string;
+            };
+        }
 
-	export = convict;
+        interface Config {
+            get(name: string): any;
+            default(name: string): any;
+            has(name: string): boolean;
+            set(name: string, value: any): void;
+            load(conf: Object): void;
+            loadFile(file: string): void;
+            loadFile(files: string[]): void;
+            validate(): void;
+            /**
+             * Exports all the properties (that is the keys and their current values) as a {JSON} {Object}
+             * @returns {Object} A {JSON} compliant {Object}
+             */
+            getProperties() : Object;
+            /**
+             * Exports the schema as a {JSON} {Object}
+             * @returns {Object} A {JSON} compliant {Object}
+             */
+            getSchema() : Object;
+            
+            /**
+             * Exports all the properties (that is the keys and their current values) as a JSON string.
+             * @returns {String} a string representing this object
+             */
+            toString() : string;
+            
+            /**
+             * Exports the schema as a JSON string.
+             * @returns {String} a string representing the schema of this {Config}
+             */
+            getSchemaString() : string;
+        }
+    }
+    interface convict {
+        addFormat(format: convict.Format): void;
+        addFormats(formats: { [name: string]: convict.Format }): void;
+        (config: convict.Schema): convict.Config;
+    }
+    var convict : convict;
+    export = convict;
 }
+