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+    BSIP:       <BSIP number>
+    Title:      Add flag to prevent asset's max supply from being changed
+    Authors:    Fabian Schuh <https://github.com/xeroc>
+                Dmitrij Vinokour <https://github.com/Dimfred>
+    Status:     Draft
+    Type:       Protocol
+    Created:    2018-10-14
+    Discussion: <url>
+    Worker:     <Id of worker proposal> (optional)
+
+# Abstract
+
+The possibility of creating assets on the BitShares Blockchain is a core feature
+of our platform. In the case of an ico, the ico-holders can create an asset with
+a fixed maximum supply. However this maximum supply can be changed by the
+asset creator (issuer) anytime. This exposes participators ico to the risk,
+of loosing value of their bought asset.
+
+With this BSIP a flag will be introduced which forbids the modification of the maximum
+supply of an issuer created asset.
+
+# Motivation
+
+The implementation of a flag, to disable the modification of the maximum supply for 
+issuer created asset, has effects for both sides. On the one side the security for the
+participators or non-issuer users increases, because the value of their assets (tokens)
+can't be manipulated by exposing the market to more created tokens. And on the other side
+it is good marketing for the ico-hoders, because they can advertise with their fixed
+maximum supply.
+
+# Rational
+
+The `disable_modify_max_supply` is a new created flag in the `asset_issuer_permissions`.
+The flag can be activated to forbid the modification of the `max_supply` (`asset_object.options`).
+Once the flag is activated, it can't be deactivated.
+
+# Specifications
+
+This BSIP comes with a change to the protocol, which requires a propotocol upgrade.
+However the changes to the code are minor.
+
+1. Add the `disable_modify_max_supply` flag to the issuer permissions
+2. Add a `can_modify_max_supply()` the `asset_object`
+3. Change the `asset_update_evaluator::evaluate` method to assert false for
+    1. the deactivation of the `disable_modify_max_supply` flag
+    2. the modification of the `max_supply` when the `disable_modify_max_supply` is set
+  
+# Summary for Shareholders
+
+This BSIP proposes a way to improve the user security in the context of issuer created
+assets.
+
+# Copyright
+
+This document is placed in the public domain.