diff --git a/CMakeModules/CalamaresAddTest.cmake b/CMakeModules/CalamaresAddTest.cmake
index 56a45d7dc..228d7cbc0 100644
--- a/CMakeModules/CalamaresAddTest.cmake
+++ b/CMakeModules/CalamaresAddTest.cmake
@@ -42,6 +42,8 @@ function( calamares_add_test )
                 Qt5::Test
             )
         calamares_automoc( ${TEST_NAME} )
+        # We specifically pass in the source directory of the test-being-
+        # compiled, so that it can find test-files in that source dir.
         target_compile_definitions( ${TEST_NAME} PRIVATE -DBUILD_AS_TEST="${CMAKE_CURRENT_SOURCE_DIR}"  ${TEST_DEFINITIONS} )
         if( TEST_GUI )
             target_link_libraries( ${TEST_NAME} calamaresui Qt5::Gui )
diff --git a/src/modules/users/Tests.cpp b/src/modules/users/Tests.cpp
index 5259fb8a8..b687a6434 100644
--- a/src/modules/users/Tests.cpp
+++ b/src/modules/users/Tests.cpp
@@ -196,6 +196,7 @@ UserTests::testDefaultGroupsYAML()
     QFETCH( int, count );
     QFETCH( QString, group );
 
+    // BUILD_AS_TEST is the source-directory path
     QFile fi( QString( "%1/%2" ).arg( BUILD_AS_TEST, filename ) );
     QVERIFY( fi.exists() );