diff --git a/CLAUDE.md b/CLAUDE.md
index a269aa7..1cfdd58 100755
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -27,12 +27,13 @@ MicCheck: open source. asp.net, c#, typescript, VueJS. Manages feature flags, pr
 - Wrap lines at 220 characters, leave single line if fewer
 - Place interfaces that are implemented by a single class at the bottom of the class file.  An interface with multiple implementations of an interface should be in a seperate file.
 - Do not use tuples for return types.  Prefer records or classes for multiple values
-- Do not use `sealed` on classes- 
+- Do not use `sealed` 
 - Use `record` for data objects, `class` for objects with behavior. Avoid mutable state where possible.
 
 ## Testing
 - BDD-style unit tests, end-to-end as possible, no external resources (DB, filesystem). e.g. `WhenAUserDoesSomething_ThenAThingAppears`
 - Mock external deps with Moq
+- Mock EntityFramework DBContexts with an extracted interface and Moq.  Do not rely on InMemory provider.
 - New features need unit tests covering as much logic as possible
 - Any modified file: evaluate for missing test coverage- 
 - No "Mock" in mocked object names