diff --git a/Documentation/SOGoInstallationGuide.asciidoc b/Documentation/SOGoInstallationGuide.asciidoc
index b0e8b238a..90306048e 100644
--- a/Documentation/SOGoInstallationGuide.asciidoc
+++ b/Documentation/SOGoInstallationGuide.asciidoc
@@ -506,7 +506,7 @@ SOGoSAML2LogoutEnabled must be set to YES. If unset, the user will be
 redirected to a blank page.
 
 |D |SOGoTimeZone
-|Parameter used to set a default time zone for users. The default
+|Mandatory parameter used to set a default time zone for users. The default
 timezone is set to UTC. The Olson database is a standard database that
 takes all the time zones around the world into account and represents
 them along with their history. On GNU/Linux systems, time zone
diff --git a/Scripts/sogo.conf b/Scripts/sogo.conf
index dd11fa398..39e47ff83 100644
--- a/Scripts/sogo.conf
+++ b/Scripts/sogo.conf
@@ -110,7 +110,7 @@
   //SOGoTrustProxyAuthentication = NO;
   //SOGoXSRFValidationEnabled = YES;
 
-  /* General */
+  /* General - SOGoTimeZone *MUST* be defined */
   //SOGoLanguage = English;
   //SOGoTimeZone = America/Montreal;
   //SOGoCalendarDefaultRoles = (