diff --git a/offlineimap.conf b/offlineimap.conf
index baff536..d3be8be 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -279,9 +279,10 @@ ssl = yes
 # sslclientkey = /path/to/file.key
 
 # SSL CA Cert(s) to verify the server cert against (optional).
-# No SSL verification is done without this option, if it is
+# No SSL verification is done without this option. If it is
 # specified, the CA Cert(s) need to verify the Server cert AND
 # match the hostname (* wildcard allowed on the left hand side)
+# The certificate should be in PEM format.
 # sslcacertfile = /path/to/cacertfile.crt
 
 # Specify the port.  If not specified, use a default port.