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diff --git a/lib/libcapsicum/capsicum_helpers.3 b/lib/libcapsicum/capsicum_helpers.3
--- a/lib/libcapsicum/capsicum_helpers.3
+++ b/lib/libcapsicum/capsicum_helpers.3
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd January 2, 2020
+.Dd May 16, 2024
.Dt CAPSICUM_HELPERS 3
.Os
.Sh NAME
@@ -150,6 +150,31 @@
and
.Xr err 3 ,
among others.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn caph_enter ,
+.Fn caph_enter_casper ,
+.Fn caph_rights_limit ,
+.Fn caph_ioctls_limit ,
+.Fn caph_fcntls_limit ,
+.Fn caph_limit_stream ,
+.Fn caph_limit_stdin ,
+.Fn caph_limit_stderr ,
+.Fn caph_limit_stdout ,
+and
+.Fn caph_limit_stdio
+return a value
+of 0.
+Otherwise, a value of -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Pp
+Functions
+.Fn caph_stream_rights ,
+.Fn caph_cache_tzdata ,
+and
+.Fn caph_cache_catpages
+can not fail.
.Ed
.Sh SEE ALSO
.Xr cap_enter 2 ,

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