diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index 3022aae..2077f3a 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -73,7 +73,7 @@
 Signing CA in parentheses (same meaning as certificates).
 
 - crl-ec-sha*: (2) server6.crt
-- crl-future.pem: (2) server6.crt + unkown
+- crl-future.pem: (2) server6.crt + unknown
 - crl-rsa-pss-*.pem: (1) server9{,badsign,with-ca}.crt + cert_sha384.crt + unknown
 - crl.pem, crl_expired.pem: (1) server1{,.cert_type,.key_usage,.v1}.crt + unknown
 - crl_md*.pem: crl_sha*.pem: (1) same as crl.pem