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diff --git a/lib/timespec/timespec.h b/lib/timespec/timespec.h
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+/* Functions for working with timespec structures
+ * Written by Daniel Collins (2017-2021)
+ * timespec_mod by Alex Forencich (2019)
+ * Various contributions by Ingo Albrecht (2021)
+ *
+ * This is free and unencumbered software released into the public domain.
+ *
+ * Anyone is free to copy, modify, publish, use, compile, sell, or
+ * distribute this software, either in source code form or as a compiled
+ * binary, for any purpose, commercial or non-commercial, and by any
+ * means.
+ *
+ * In jurisdictions that recognize copyright laws, the author or authors
+ * of this software dedicate any and all copyright interest in the
+ * software to the public domain. We make this dedication for the benefit
+ * of the public at large and to the detriment of our heirs and
+ * successors. We intend this dedication to be an overt act of
+ * relinquishment in perpetuity of all present and future rights to this
+ * software under copyright law.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * For more information, please refer to <http://unlicense.org/>
+*/
+
+#ifndef DAN_TIMESPEC_H
+#define DAN_TIMESPEC_H
+
+#include <stdbool.h>
+#include <sys/time.h>
+#include <time.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct timespec timespec_add(struct timespec ts1, struct timespec ts2);
+struct timespec timespec_sub(struct timespec ts1, struct timespec ts2);
+struct timespec timespec_mod(struct timespec ts1, struct timespec ts2);
+
+struct timespec timespec_min(struct timespec ts1, struct timespec ts2);
+struct timespec timespec_max(struct timespec ts1, struct timespec ts2);
+struct timespec timespec_clamp(struct timespec ts1, struct timespec min, struct timespec max);
+
+int  timespec_cmp(struct timespec ts1, struct timespec ts2);
+bool timespec_eq(struct timespec ts1, struct timespec ts2);
+bool timespec_gt(struct timespec ts1, struct timespec ts2);
+bool timespec_ge(struct timespec ts1, struct timespec ts2);
+bool timespec_lt(struct timespec ts1, struct timespec ts2);
+bool timespec_le(struct timespec ts1, struct timespec ts2);
+
+struct timespec timespec_from_double(double s);
+double timespec_to_double(struct timespec ts);
+struct timespec timespec_from_timeval(struct timeval tv);
+struct timeval timespec_to_timeval(struct timespec ts);
+struct timespec timespec_from_ms(long milliseconds);
+long timespec_to_ms(struct timespec ts);
+
+struct timespec timespec_normalise(struct timespec ts);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !DAN_TIMESPEC_H */