diff --git a/docs/cmdline-opts/cert-type.d b/docs/cmdline-opts/cert-type.d
index a04bdce5d..55d8033b4 100644
--- a/docs/cmdline-opts/cert-type.d
+++ b/docs/cmdline-opts/cert-type.d
@@ -1,10 +1,10 @@
 Long: cert-type
 Protocols: TLS
 Arg: <type>
-Help: Certificate file type (DER/PEM/ENG)
+Help: Certificate file type
 See-also: cert key key-type
 ---
-Tells curl what certificate type the provided certificate is in. PEM, DER and
-ENG are recognized types.  If not specified, PEM is assumed.
+Tells curl what type the provided client certificate is using. PEM, DER, ENG
+and P12 are recognized types.  If not specified, PEM is assumed.
 
 If this option is used several times, the last one will be used.