Update public-ip-address-prefix.md

added a bit of clarity
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cc: @asudbring

Author: brianlehr

articles/virtual-network/ip-services/public-ip-address-prefix.md

@@ -56,7 +56,7 @@ Resource|Scenario|Steps|
 
 ## Limitations
 
-- You can't specify the IP addresses for the prefix. Azure gives the IP addresses for the prefix, based on the size that you specify.  Additionally, all public IP addresses created from the prefix must exist in the same Azure region and subscription as the prefix. Addresses must be assigned to resources in the same region and subscription.
+- You can't specify the set of IP addresses for the prefix (though you can specify which IP you want from the prefix). Azure gives the IP addresses for the prefix, based on the size that you specify.  Additionally, all public IP addresses created from the prefix must exist in the same Azure region and subscription as the prefix. Addresses must be assigned to resources in the same region and subscription.
 - You can create a prefix of up to 16 IP addresses. Review [Network limits increase requests](../../azure-portal/supportability/networking-quota-requests.md) and [Azure limits](../../azure-resource-manager/management/azure-subscription-service-limits.md?toc=%2fazure%2fvirtual-network%2ftoc.json#azure-resource-manager-virtual-networking-limits) for more information.
 - The size of the range cannot be modified after the prefix has been created.
 - Only static public IP addresses created with the standard SKU can be assigned from the prefix's range. To learn more about public IP address SKUs, see [public IP address](public-ip-addresses.md#public-ip-addresses).