diff --git a/tools/icu/iculslocs.cc b/tools/icu/iculslocs.cc
index 3ceb8d2a4d81d0..24bc6287ea8131 100644
--- a/tools/icu/iculslocs.cc
+++ b/tools/icu/iculslocs.cc
@@ -270,9 +270,9 @@ int list(const char* toBundle) {
   if (bf != NULL) {  // NOLINT (readability/null_usage)
     // write the HEADER
     fprintf(bf,
-            "// Warning this file is automatically generated\n"
-            "// Updated by %s based on %s:%s.txt\n",
-            PROG,
+            "// NOTE: This file was generated during the build process.\n"
+            "// Generator: tools/icu/iculslocs.cc\n"
+            "// Input package-tree/item: %s/%s.res\n",
             packageName.data(),
             locale);
     fprintf(bf,