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+This clang plugin code generates a JSON file for each compiler input
+file. The JSON file contains information about the C++ symbols that
+are referenced by the input file. The data is eventually consumed by
+Searchfox. See https://github.com/mozsearch/mozsearch for more
+information.
+
+This plugin is enabled with the --enable-clang-plugin and
+--enable-mozsearch-plugin mozconfig options. The output of the plugin
+is stored in $OBJDIR/mozsearch_index.
+
+This code is not a checker, unlike other parts of the Mozilla clang
+plugin. It cannot be used with clang-tidy.