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-rw-r--r--src/nvim/mbyte.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/nvim/mbyte.c b/src/nvim/mbyte.c
index fd353d8a67..f8451e62e2 100644
--- a/src/nvim/mbyte.c
+++ b/src/nvim/mbyte.c
@@ -1323,6 +1323,9 @@ int utf_fold(int a)
// invalid values or can't handle latin1 when the locale is C.
// Speed is most important here.
+// Note: UnicodeData.txt does not define U+1E9E as being the corresponding upper
+// case letter for U+00DF (ß), however it is part of the toLower table
+
/// Return the upper-case equivalent of "a", which is a UCS-4 character. Use
/// simple case folding.
int mb_toupper(int a)