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-rw-r--r--docs/unix/quickref.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/unix/quickref.rst b/docs/unix/quickref.rst
index ec5312a535..2eac1edc79 100644
--- a/docs/unix/quickref.rst
+++ b/docs/unix/quickref.rst
@@ -73,6 +73,8 @@ General options:
- ``-X heapsize=<n>[w][K|M]`` sets the heap size for the garbage collector.
The suffix ``w`` means words instead of bytes. ``K`` means x1024 and ``M``
means x1024x1024.
+ - ``-X realtime`` sets thread priority to realtime. This can be used to
+ improve timer precision. Only available on macOS.