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diff --git a/docs/SourceBasedCodeCoverage.rst b/docs/SourceBasedCodeCoverage.rst
index abb682355b..8e72b2287e 100644
--- a/docs/SourceBasedCodeCoverage.rst
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@@ -256,6 +256,8 @@ without using static initializers, do this manually:
otherwise. Calling this function multiple times appends profile data to an
existing on-disk raw profile.
+In C++ files, declare these as ``extern "C"``.
+
Collecting coverage reports for the llvm project
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