diff --git a/CHANGELOG.md b/CHANGELOG.md
index db31af3..2c22449 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ All notable changes are documented here. Format based on [Keep a Changelog](http
 ## [Unreleased]
 
 ### Added
+- `StreamsModule.estimateFee(operation)` runs a Soroban simulation for any stream operation and returns the exact estimated network fee (`FeeEstimate` with `totalFee`, `resourceFee`, `baseFee`, `instructions`) so the UI can display the fee before the user clicks "Create Stream".
 - `Module36` stream snapshot diff engine with LRU memoization for Feature #36 (#370); `getPerformanceMetrics()` reports an honest, workload-dependent measured speedup rather than a fixed percentage
 - `Module26` stream portfolio aggregator with LRU memoization for Feature #26 (#360); `getPerformanceMetrics()` reports an honest, workload-dependent measured speedup rather than a fixed percentage