diff --git a/man3/ccosh.3 b/man3/ccosh.3
index 0fb0c7d5e..cdfa85fd4 100644
--- a/man3/ccosh.3
+++ b/man3/ccosh.3
@@ -15,8 +15,11 @@ ccosh, ccoshf, ccoshl \- complex hyperbolic cosine
 .sp
 Link with \fI\-lm\fP.
 .SH DESCRIPTION
-The complex hyperbolic cosine function ccosh(z) is defined as
-(exp(z)+exp(\-z))/2.
+The complex hyperbolic cosine function is defined as
+.nf
+
+    ccosh(z) = (exp(z)+exp(\-z))/2
+.fi
 .SH "CONFORMING TO"
 C99
 .SH "SEE ALSO"
diff --git a/man3/csinh.3 b/man3/csinh.3
index dfa259ab0..967bdab0a 100644
--- a/man3/csinh.3
+++ b/man3/csinh.3
@@ -15,8 +15,11 @@ csinh, csinhf, csinhl \- complex hyperbolic sine
 .sp
 Link with \fI\-lm\fP.
 .SH DESCRIPTION
-The complex hyperbolic sine function sinh(z) is defined as
-(exp(z)\-exp(\-z))/2.
+The complex hyperbolic sine function is defined as:
+.nf
+
+    csinh(z) = (exp(z)\-exp(\-z))/2
+.fi
 .SH "CONFORMING TO"
 C99
 .SH "SEE ALSO"