diff --git a/xcode/build_phases/copy_paste_detection.sh b/xcode/build_phases/copy_paste_detection.sh
index 1bd10a6..0ab2b1a 100644
--- a/xcode/build_phases/copy_paste_detection.sh
+++ b/xcode/build_phases/copy_paste_detection.sh
@@ -8,6 +8,7 @@
 #
 # Required environment variables:
 #   PROJECT_DIR - project directory.
+#   SCRIPT_DIR - directory of current script.
 #
 # Optional environment variables:
 #   SCRIPT_INPUT_FILE_COUNT - number of files listed in "Input files" of build phase.