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-rw-r--r--clang/tools/libclang/CXString.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/clang/tools/libclang/CXString.h b/clang/tools/libclang/CXString.h
index 0495ee96166..06887124fa5 100644
--- a/clang/tools/libclang/CXString.h
+++ b/clang/tools/libclang/CXString.h
@@ -29,6 +29,8 @@ struct CXStringBuf;
CXString createEmpty();
/// \brief Create a CXString object for an NULL string.
+///
+/// A NULL string should be used as an "invalid" value in case of errors.
CXString createNull();
/// \brief Create a CXString object from a C string.
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