Quick data point that I've been able to get LLMs (recently whatever one clude gives me) to produce amazingly useful results for the purpose of understanding com

Quick data point that I've been able to get LLMs (recently whatever one clude gives me) to produce amazingly useful results for the purpose of understanding complex codebases, just by asking it to look at the code and tell me how it does xyz. No complicated long prompt. Basically exactly what I'd say to a human.