E3-1024: Update changelog

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Bugfixes
 * Fixed issue where updated dependencies of substitution files did not retrigger a .db expansion.
+* db expansion happens at build time, not at install time.
 
 ### Other changes
 * Remove `IOCNAME:exit` PV. Stop loading `softIocExit.db` and now it's require that exposes the `BaseVersion` PV.