diff --git a/README.md b/README.md
index 1aa3460..6a48ce4 100644
--- a/README.md
+++ b/README.md
@@ -45,9 +45,13 @@ ratio, or ... some other weirdness)
 
 # Tech notes
 
-Run tests with `cabal test --test-show-details=always`: if you don't
+Use `nix-shell`. Inside the shell
+
+* run tests with `cabal test --test-show-details=always`: if you don't
 ask for details it won't tell you about incomplete pattern matches
 
+* run the app with `cabal run`
+
 
 ----
 
@@ -68,3 +72,4 @@ _Do not look below this line_
 * and boring stuff like auth[zn]
 * frontend can get data from backend
 * for DX, backend can serve the js files needed by frontend
+* we only have yesod-core, may need other parts as well