diff --git a/Python/initconfig.c b/Python/initconfig.c
index e882a1f..3caed38 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -42,7 +42,8 @@
          and comparing bytes/bytearray with str. (-bb: issue errors)\n\
 -B     : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x\n\
 -c cmd : program passed in as string (terminates option list)\n\
--d     : debug output from parser; also PYTHONDEBUG=x\n\
+-d     : turn on parser debugging output (for experts only, only works on\n\
+         debug builds); also PYTHONDEBUG=x\n\
 -E     : ignore PYTHON* environment variables (such as PYTHONPATH)\n\
 -h     : print this help message and exit (also --help)\n\
 ";