diff --git a/backend/jest.config.js b/backend/jest.config.js
index 9e6ca4602..79add8789 100644
--- a/backend/jest.config.js
+++ b/backend/jest.config.js
@@ -6,6 +6,7 @@ module.exports = {
   collectCoverageFrom: ['src/**/*.ts', '!**/node_modules/**'],
   moduleNameMapper: {
     '@entity/(.*)': '<rootDir>/../database/build/entity/$1',
+    // This is hack to fix a problem with the library `ts-mysql-migrate` which does differentiate between its ts/js state
     '@dbTools/(.*)': process.env.NODE_ENV === 'development' ? '<rootDir>/../database/src/$1' : '<rootDir>/../database/build/src/$1',
   },
 }