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-rw-r--r--docs/reference/manifest.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/reference/manifest.rst b/docs/reference/manifest.rst
index 078c4c7cf6..b756de47ed 100644
--- a/docs/reference/manifest.rst
+++ b/docs/reference/manifest.rst
@@ -57,7 +57,7 @@ Freezing source code
directory then all files in that directory will be frozen.
*opt* is the optimisation level to pass to mpy-cross when compiling ``.py``
- to ``.mpy``.
+ to ``.mpy``. These levels are described in :func:`micropython.opt_level`.
.. function:: freeze_as_str(path)