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diff --git a/src/pipeutils.h b/src/pipeutils.h
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+/* pipeutils.h -- Utilities for using pipes as signals
+   This file is part of Redshift.
+
+   Redshift is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Redshift 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Redshift.  If not, see <http://www.gnu.org/licenses/>.
+
+   Copyright (c) 2017  Jon Lund Steffensen <jonlst@gmail.com>
+*/
+
+#ifndef REDSHIFT_PIPEUTILS_H
+#define REDSHIFT_PIPEUTILS_H
+
+int pipeutils_create_nonblocking(int pipefds[2]);
+
+void pipeutils_signal(int write_fd);
+void pipeutils_handle_signal(int read_fd);
+
+#endif /* ! REDSHIFT_PIPEUTILS_H */