diff --git a/xcode/build_phases/documentation_generator.sh b/xcode/build_phases/documentation_generator.sh
index a5449b7..ffd4828 100644
--- a/xcode/build_phases/documentation_generator.sh
+++ b/xcode/build_phases/documentation_generator.sh
@@ -1 +1,2 @@
-. build-scripts/xcode/aux_scripts/certificates_readme_generator.sh > $PROJECT_DIR/Certificates/README.md
\ No newline at end of file
+readonly BUILD_SCRIPTS_DIR=${1:-${PROJECT_DIR}} # first argument or PROJECT_DIR
+. $BUILD_SCRIPTS_DIR/build-scripts/xcode/aux_scripts/certificates_readme_generator.sh > $PROJECT_DIR/Certificates/README.md