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diff --git a/lib/msun/man/acos.3 b/lib/msun/man/acos.3
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--- a/lib/msun/man/acos.3
+++ b/lib/msun/man/acos.3
@@ -39,6 +39,8 @@
.Nm acos ,
.Nm acosf
.Nd arc cosine functions
+.Sh LIBRARY
+.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
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