diff --git a/doc/config.md b/doc/config.md
index 485d1b2..089bb7a 100644
--- a/doc/config.md
+++ b/doc/config.md
@@ -231,7 +231,7 @@ This option is only valid when INBUCKET_SMTP_TLSENABLED is enabled.
 
 ### TLS Public Certificate File
 
-`INBUCKET_SMTP_TLSPRIVKEY`
+`INBUCKET_SMTP_TLSCERT`
 
 Specify the x509 Certificate file to be used for TLS negotiation.
 This option is only valid when INBUCKET_SMTP_TLSENABLED is enabled.