diff --git a/README.md b/README.md
index 2875cb0..e44f60f 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ An implementation of JSON Schema, based on IETF's draft v4 - Go language
 
 Working, but not all keyword are yet implemented.
 
-What is missing : definitions, dependencies, additionalProperties, full coverage of items, additionalItems
+What is missing : definitions, dependencies, full coverage of items, additionalItems
 
-Testing / debugging / improvements in progress ( 69% of Json Schema Test Suite )
+Testing / debugging / improvements in progress ( 71% of Json Schema Test Suite )
 
 ## Usage 
 
diff --git a/schema_test.go b/schema_test.go
index a4458d2..bbd7d58 100644
--- a/schema_test.go
+++ b/schema_test.go
@@ -236,10 +236,10 @@ func TestJsonSchemaTestSuite(t *testing.T) {
 		map[string]string{"phase": "additionalProperties being false does not allow other properties", "test": "no additional properties is valid", "schema": "additionalProperties/schema_0.json", "data": "additionalProperties/data_00.json", "valid": "true"},
 		map[string]string{"phase": "additionalProperties being false does not allow other properties", "test": "an additional property is invalid", "schema": "additionalProperties/schema_0.json", "data": "additionalProperties/data_01.json", "valid": "false"},
 		map[string]string{"phase": "additionalProperties being false does not allow other properties", "test": "ignores non-objects", "schema": "additionalProperties/schema_0.json", "data": "additionalProperties/data_02.json", "valid": "true"},
-		//map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "no additional properties is valid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_10.json", "valid": "true"},
-		//map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "an additional valid property is valid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_11.json", "valid": "true"},
-		//map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "an additional invalid property is invalid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_12.json", "valid": "false"},
-		//map[string]string{"phase": "additionalProperties are allowed by default", "test": "additional properties are allowed", "schema": "additionalProperties/schema_2.json", "data": "additionalProperties/data_20.json", "valid": "true"},
+		map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "no additional properties is valid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_10.json", "valid": "true"},
+		map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "an additional valid property is valid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_11.json", "valid": "true"},
+		map[string]string{"phase": "additionalProperties allows a schema which should validate", "test": "an additional invalid property is invalid", "schema": "additionalProperties/schema_1.json", "data": "additionalProperties/data_12.json", "valid": "false"},
+		map[string]string{"phase": "additionalProperties are allowed by default", "test": "additional properties are allowed", "schema": "additionalProperties/schema_2.json", "data": "additionalProperties/data_20.json", "valid": "true"},
 		map[string]string{"phase": "dependencies", "test": "neither", "schema": "dependencies/schema_0.json", "data": "dependencies/data_00.json", "valid": "true"},
 		map[string]string{"phase": "dependencies", "test": "nondependant", "schema": "dependencies/schema_0.json", "data": "dependencies/data_01.json", "valid": "true"},
 		map[string]string{"phase": "dependencies", "test": "with dependency", "schema": "dependencies/schema_0.json", "data": "dependencies/data_02.json", "valid": "true"},
diff --git a/validation.go b/validation.go
index 60ff52e..2b5a22d 100644
--- a/validation.go
+++ b/validation.go
@@ -45,6 +45,9 @@ func (v *ValidationResult) GetErrorMessages() []string {
 
 func (v *ValidationResult) CopyErrorMessages(others []string) {
 	v.errorMessages = append(v.errorMessages, others...)
+	if len(others) > 0 {
+		v.valid = false
+	}
 }
 
 func (v *ValidationResult) addErrorMessage(message string) {
@@ -332,8 +335,23 @@ func (v *jsonSchema) validateObject(currentSchema *jsonSchema, value map[string]
 				}
 			}
 
-		case map[string]interface{}:
-			fmt.Printf("map %v %v\n", value, currentSchema)
+		case *jsonSchema:
+			additionalPropertiesSchema := currentSchema.additionalProperties.(*jsonSchema)
+			for pk := range value {
+				found := false
+				for _, spValue := range currentSchema.propertiesChildren {
+					if pk == spValue.property {
+						found = true
+					}
+				}
+				if !found {
+					validationResult := additionalPropertiesSchema.Validate(value[pk])
+					if !validationResult.IsValid() {
+						result.CopyErrorMessages(validationResult.GetErrorMessages())
+					}
+				}
+			}
+
 		}
 	}