diff --git a/web-doc/openssl.md b/web-doc/openssl.md
new file mode 100644
index 0000000..79c6f8b
--- /dev/null
+++ b/web-doc/openssl.md
@@ -0,0 +1,5 @@
+# OpenSSL Cheatsheet
+
+## Certificate Viewing
+- openssl x509 -in cert.pem -noout -text
+- openssl crl2pkcs7 -nocrl -certfile chained-cert.pem | openssl pkcs7 -print_certs -noout -text