Sales playbook cross-sell minor addition (#10174)

contents/handbook/growth/sales/expansion-and-retention.md

@@ -79,7 +79,9 @@ You can use these signals alongside regular customer interactions to prioritize
   - Already doing it in house/with something else - demonstrated cool ways in which the products integrate and save their team time
   - May be too far down the line with their own data warehouse - it is hard to do a replacement at this stage, so instead talk about how you can enrich their data in PostHog with what's already in their data warehouse
   - Not ready to invest the time and resources to implement more tools - tie this to the pain of _not_ having an additional solution in place and emphasize time to value is extremely quick with PostHog e.g. with autocapture, session replay, and (soon) no-code experiments. 
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+> Pro tip - if a customer isn't using a PostHog product and there is no obvious reason why they shouldn't, ask them directly why they're not using it!
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 These are typically combinations of products that we've seen be successful:
 
 - Product analytics + Web analytics