2 files changed, 14 insertions, 0 deletions
diff --git a/docs/cmdline-opts/cert.d b/docs/cmdline-opts/cert.d
index adf62fc7a..510b8333f 100644
--- a/docs/cmdline-opts/cert.d
+++ b/docs/cmdline-opts/cert.d
@@ -23,6 +23,13 @@ nickname contains ":", it needs to be preceded by "\\" so that it is not
 recognized as password delimiter.  If the nickname contains "\\", it needs to
 be escaped as "\\\\" so that it is not recognized as an escape character.
 
+If curl is built against OpenSSL library, and the engine pkcs11 is available,
+then a PKCS#11 URI (RFC 7512) can be used to specify a certificate located in
+a PKCS#11 device. A string beginning with "pkcs11:" will be interpreted as a
+PKCS#11 URI. If a PKCS#11 URI is provided, then the --engine option will be set
+as "pkcs11" if none was provided and the --cert-type option will be set as
+"ENG" if none was provided.
+
 (iOS and macOS only) If curl is built against Secure Transport, then the
 certificate string can either be the name of a certificate/private key in the
 system or user keychain, or the path to a PKCS#12-encoded certificate and
diff --git a/docs/cmdline-opts/key.d b/docs/cmdline-opts/key.d
index fbf583af0..4877b4238 100644
--- a/docs/cmdline-opts/key.d
+++ b/docs/cmdline-opts/key.d
@@ -7,4 +7,11 @@ Private key file name. Allows you to provide your private key in this separate
 file. For SSH, if not specified, curl tries the following candidates in order:
 '~/.ssh/id_rsa', '~/.ssh/id_dsa', './id_rsa', './id_dsa'.
 
+If curl is built against OpenSSL library, and the engine pkcs11 is available,
+then a PKCS#11 URI (RFC 7512) can be used to specify a private key located in a
+PKCS#11 device. A string beginning with "pkcs11:" will be interpreted as a
+PKCS#11 URI. If a PKCS#11 URI is provided, then the --engine option will be set
+as "pkcs11" if none was provided and the --key-type option will be set as
+"ENG" if none was provided.
+
 If this option is used several times, the last one will be used.