Update adr-chat-module-architecture.md

Signed-off-by: Anastas Stoyanovsky <astoyano@redhat.com>

Author: anastasds

docs/adr-chat-module-architecture.md

@@ -8,6 +8,8 @@ Tuning retrieval systems requires significant expertise and testing, and there a
 
 Having a single code path that conditionally executes various strategies based on a mixture of configuration, application state, and user input can quickly become difficult to maintain, debug, and even understand. That chat module in InstructLab would benefit from a principled approach; that is, to be purposefully architected before becoming a [big ball of mud](http://www.laputan.org/mud/?ref=blog.codinghorror.com). 
 
+Prompt template management, model interaction pattern, chat session history, and any interactions with third party systems can vary by use case and so should be logically grouped for purposes of at least maintainability, understandability, modifiability, and testability.
+
 ## Decision
 
 The InstructLab chat module will adopt a [strategy pattern](https://en.wikipedia.org/wiki/Strategy_pattern).