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diff --git a/man3/atan.3 b/man3/atan.3
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@@ -87,7 +87,9 @@ T} Thread safety MT-Safe
.ad
.sp 1
.SH STANDARDS
-C99, POSIX.1-2001, POSIX.1-2008.
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
.PP
The variant returning
.I double