diff --git a/src/header/sys_times/cbindgen.toml b/src/header/sys_times/cbindgen.toml
index 053234a2f6..786c296bfe 100644
--- a/src/header/sys_times/cbindgen.toml
+++ b/src/header/sys_times/cbindgen.toml
@@ -1,4 +1,7 @@
-sys_includes = []
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_times.h.html
+#
+# Spec quotations relating to includes:
+# - "The <sys/times.h> header shall define the clock_t type as described in <sys/types.h>."
 after_includes = """
 #include <bits/clock-t.h> // for clock_t from sys/types.h
 """