diff --git a/runformat b/runformat
index 4f44597e8..bb8c45746 100755
--- a/runformat
+++ b/runformat
@@ -1,4 +1,10 @@
 #!/bin/bash
+#
+# uncrustify-0.72 is used to format cppcheck source code.
+# source code: https://github.com/uncrustify/uncrustify/archive/refs/tags/uncrustify-0.72.0.zip
+# building in Linux: mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release .. && make
+# building in Windows: mkdir build && cd build && cmake -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release .. && nmake
+
 UNCRUSTIFY_VERSION="0.72.0"
 UNCRUSTIFY="${UNCRUSTIFY-uncrustify}"