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diff --git a/lib/unicase/caseprop.h b/lib/unicase/caseprop.h
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+/* Case related properties of Unicode characters.
+   Copyright (C) 2009-2022 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This file is free software.
+   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
+   You can redistribute it and/or modify it under either
+     - the terms of the GNU Lesser General Public License as published
+       by the Free Software Foundation, either version 3, or (at your
+       option) any later version, or
+     - the terms of the GNU General Public License as published by the
+       Free Software Foundation; either version 2, or (at your option)
+       any later version, or
+     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License and the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License and of the GNU General Public License along with this
+   program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stdbool.h>
+#include "unitypes.h"
+
+/* Determine whether a character is "cased" according to the Unicode Standard,
+   <https://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
+   definition D120.  */
+extern bool
+       uc_is_cased (ucs4_t uc)
+       _UC_ATTRIBUTE_CONST;
+
+/* Determine whether a character is "case-ignorable"
+   according to the Unicode Standard,
+   <https://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
+   definition D121.  */
+extern bool
+       uc_is_case_ignorable (ucs4_t uc)
+       _UC_ATTRIBUTE_CONST;