diff --git a/doc/build.md b/doc/build.md
index 1f33a49ed53c3e611b3d58e5fc75d972d8637f7c..91d130cad7142884cf8fc9fd7fcd046f46fdc52a 100644
--- a/doc/build.md
+++ b/doc/build.md
@@ -80,7 +80,7 @@ cmake -DHDBPP_TDB_BUILD_TESTS=ON ..
 make
 ```
 
-To run all unit tests, a postgresql database node is required with the project schema loaded up. To run all tests:
+To run all unit tests, a postgresql database node is required with the project schema loaded up. Also note the connection string to this database node needs setting in TestHelpers.hpp. To run all tests:
 
 ```bash
 ./test/unit-tests