diff --git a/lib/msun/man/cacos.3 b/lib/msun/man/cacos.3
index 6d9f20a01545..ea30f9600da0 100644
--- a/lib/msun/man/cacos.3
+++ b/lib/msun/man/cacos.3
@@ -136,9 +136,9 @@ corresponding ranges for the return values, adopted by the C language.
 .It Sy Function Ta Sy Branch Cut(s) Ta Sy Range
 .It cacos Ta (-\*(If, -1) \*(Un (1, \*(If) Ta [0, \*(Pi]
 .It casin Ta (-\*(If, -1) \*(Un (1, \*(If) Ta [-\*(Pi/2, \*(Pi/2]
-.It catan Ta (-\*(If*I, -i) \*(Un (I, \*(If*I) Ta [-\*(Pi/2, \*(Pi/2]
+.It catan Ta (-\*(If*I, -I) \*(Un (I, \*(If*I) Ta [-\*(Pi/2, \*(Pi/2]
 .It cacosh Ta (-\*(If, 1) Ta [-\*(Pi*I, \*(Pi*I]
-.It casinh Ta (-\*(If*I, -i) \*(Un (I, \*(If*I) Ta [-\*(Pi/2*I, \*(Pi/2*I]
+.It casinh Ta (-\*(If*I, -I) \*(Un (I, \*(If*I) Ta [-\*(Pi/2*I, \*(Pi/2*I]
 .It catanh Ta (-\*(If, -1) \*(Un (1, \*(If) Ta [-\*(Pi/2*I, \*(Pi/2*I]
 .El
 .Sh SEE ALSO