diff --git a/ApiDocumentation/Implementations/ModelsGenerator.cs b/ApiDocumentation/Implementations/ModelsGenerator.cs
index 57355b3..e15b5ba 100644
--- a/ApiDocumentation/Implementations/ModelsGenerator.cs
+++ b/ApiDocumentation/Implementations/ModelsGenerator.cs
@@ -40,7 +40,10 @@ public virtual Dictionary<String, ApiDocModel> GetModels( Type type )
 			if ( IsArray( type ) )
 				type = type.GetElementType();
 
-			var name = _typeToStringConverter.GetApiOperationType( type );
+            if (IsNullableType(type))
+                type = Nullable.GetUnderlyingType(type);
+
+            var name = _typeToStringConverter.GetApiOperationType( type );
 			var apiDocModels = InitializeApiDocModels( name );
 
 			ProcessType( type, apiDocModels );
@@ -52,7 +55,12 @@ private static bool IsTask(Type type)
 			=> type.IsGenericType
 			   && type.GetGenericTypeDefinition() == typeof(Task<>);
 
-		private void ProcessType( Type type, Dictionary<string, ApiDocModel> apiDocModels )
+        private static bool IsNullableType(Type typeToConvert)
+        {
+            return Nullable.GetUnderlyingType(typeToConvert) != null;
+        }
+
+        private void ProcessType( Type type, Dictionary<string, ApiDocModel> apiDocModels )
 		{
 			foreach ( var property in type.GetProperties() )
 			{
@@ -81,8 +89,12 @@ private void ProcessType( Type type, Dictionary<string, ApiDocModel> apiDocModel
 
 					modelProperty = GetArrayModelProperty( typeof( KeyValuePair<,> ) );
 				}
+				else if (IsNullableType(propertyType))
+                {
+                    propertyType = Nullable.GetUnderlyingType(propertyType);
+                }
 
-				GetNonPrimitiveModels( propertyType, apiDocModels );
+                GetNonPrimitiveModels( propertyType, apiDocModels );
 				apiDocModels.First().Value.properties.Add( property.Name, modelProperty );
 				if ( property.GetCustomAttributes( typeof( OptionalAttribute ), true ).Length == 0 )
 					apiDocModels.First().Value.required.Add( property.Name );
diff --git a/ApiDocumentation/Implementations/SwaggerDocumentationTools.cs b/ApiDocumentation/Implementations/SwaggerDocumentationTools.cs
index 7c3e442..f6b5bae 100644
--- a/ApiDocumentation/Implementations/SwaggerDocumentationTools.cs
+++ b/ApiDocumentation/Implementations/SwaggerDocumentationTools.cs
@@ -88,9 +88,13 @@ public Dictionary<string, ApiDocModel> GetControllerModels( Type controllerType
 			foreach ( var apiDocumentationAttributesAndReturnType in GetApiDocumentationAttributesAndReturnTypes( controllerType ) )
 			{
 				result.Merge( _modelsGenerator.GetModels( apiDocumentationAttributesAndReturnType.Key.ReturnType ?? apiDocumentationAttributesAndReturnType.Value ) );
-			}
 
-			return result;
+                //Get models for parameters
+                if ( apiDocumentationAttributesAndReturnType.Key.FormBody != null )
+                    result.Merge( _modelsGenerator.GetModels(apiDocumentationAttributesAndReturnType.Key.FormBody) );
+            }
+
+            return result;
 		}
 
 		private IEnumerable<MethodInfo> GetControllerMethods( Type controllerType )