diff --git a/pages/common/openssl.md b/pages/common/openssl.md
index c38e9b1954..3288ac7ed4 100644
--- a/pages/common/openssl.md
+++ b/pages/common/openssl.md
@@ -14,6 +14,10 @@
 
 `openssl x509 -req -days {{days}} -in {{filename.csr}} -signkey {{filename.key}} -out {{filename.crt}}`
 
+- Display the start and expiry dates for a domain's certificate:
+
+`openssl s_client -connect {{host}}:{{port}} 2>/dev/null | openssl x509 -noout -dates`
+
 - Display the certificate presented by an SSL/TLS server:
 
 `openssl s_client -connect {{host}}:{{port}} </dev/null`