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diff --git a/docs/PCHInternals.rst b/docs/PCHInternals.rst
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@@ -65,9 +65,6 @@ be included at the beginning of the translation unit. The extensions to the
AST file format required for modules are discussed in the section on
:ref:`modules <pchinternals-modules>`.
-Clang's AST files are Mach-O, ELF, or COFF containers that contain a
-``__clangast`` section which holds the AST bitstream.
-
Clang's AST files are designed with a compact on-disk representation, which
minimizes both creation time and the time required to initially load the AST
file. The AST file itself contains a serialized representation of Clang's