From f9e3c9764161258b6de82efb311c51783624b20d Mon Sep 17 00:00:00 2001
From: huangtianhua <huangtianhua@huawei.com>
Date: Fri, 25 Mar 2016 18:07:48 +0800
Subject: [PATCH] Introduce 'immutable' of parameters

'immutable' is supported in parameters section,
add some guidlines for new attribute.

Change-Id: I8b102ffd2969d88ce19570764e10482cc52e49af
---
 doc/source/template_guide/hot_spec.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/source/template_guide/hot_spec.rst b/doc/source/template_guide/hot_spec.rst
index e88549c20f..335a006daf 100644
--- a/doc/source/template_guide/hot_spec.rst
+++ b/doc/source/template_guide/hot_spec.rst
@@ -267,6 +267,7 @@ default value defined as nested elements.
       hidden: <true | false>
       constraints:
         <parameter constraints>
+      immutable: <true | false>
 
 param name
     The name of the parameter.
@@ -303,6 +304,11 @@ constraints
     if the parameter value doesn't comply to the constraints.
     This attribute is optional.
 
+immutable
+    Defines whether the parameter is updatable. Stack update fails, if this is
+    set to ``true`` and the parameter value is changed.
+    This attribute is optional and defaults to ``false``.
+
 The table below describes all currently supported types with examples:
 
 +----------------------+-------------------------------+------------------+