add detail that only the token in the vesting schedule will be added to it, not others (#291)

Author: tac0turtle

cips/cip-031.md

@@ -59,6 +59,10 @@ By integrating staking rewards directly into the lockup schedule, this proposal
 - **Validator Commission:**
      Commission rewards are split from staking rewards: commissions go directly to the account (unlocked) while staking rewards follow the lockup schedule.
 
+- **Non Locked Coins Rewards**
+  Within the Cosmos SDK rewards can be a variety of tokens not only the staking token. Secondly a lockup account can have multiple tokens too. When UpdateSchedule is called, we will only append the tokens included in the vesting schedule.
+  Example: If the rewards for a delegator are (`100 tia, 100foo`) and the lockup schedule only includes `tia` we will only lock up the `tia` and allow the `foo` token to be freely transferred out of the account.
+
 #### Token State Management
 
    Tokens are tracked in four states: