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-rw-r--r--Doc/using/cmdline.rst7
1 files changed, 5 insertions, 2 deletions
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 0574336cf3..fd47ce2ab5 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -922,15 +922,18 @@ conflict.
Debug-mode variables
~~~~~~~~~~~~~~~~~~~~
-Setting these variables only has an effect in a debug build of Python, that is,
-if Python was configured with the ``--with-pydebug`` build option.
+Setting these variables only has an effect in a debug build of Python.
.. envvar:: PYTHONTHREADDEBUG
If set, Python will print threading debug info.
+ Need Python configured with the ``--with-pydebug`` build option.
+
.. envvar:: PYTHONDUMPREFS
If set, Python will dump objects and reference counts still alive after
shutting down the interpreter.
+
+ Need Python configured with the ``--with-trace-refs`` build option.