diff --git a/docs/libssh2_userauth_publickey_fromfile_ex.3 b/docs/libssh2_userauth_publickey_fromfile_ex.3
index ad6eee0c..0d77c9a3 100644
--- a/docs/libssh2_userauth_publickey_fromfile_ex.3
+++ b/docs/libssh2_userauth_publickey_fromfile_ex.3
@@ -7,6 +7,7 @@ libssh2_userauth_publickey_fromfile - authenticate a session with a public key,
 .nf
 int libssh2_userauth_publickey_fromfile_ex(LIBSSH2_SESSION *session,
                                            const char *username,
+                                           unsigned int ousername_len,
                                            const char *publickey,
                                            const char *privatekey,
                                            const char *passphrase);