diff --git a/doc/Installation/Installation-(RHEL-CentOS).md b/doc/Installation/Installation-(RHEL-CentOS).md
index cc9cf82043..a52bc5417b 100644
--- a/doc/Installation/Installation-(RHEL-CentOS).md
+++ b/doc/Installation/Installation-(RHEL-CentOS).md
@@ -285,6 +285,11 @@ First, create and chown the `rrd` directory and create the `logs` directory
     restorecon -RFvv /opt/librenms/logs/
 ```
 
+Set selinux to allow httpd to sendmail
+```bash
+    setsebool -P httpd_can_sendmail=1
+```
+
 Start the web-server:
 
 **CentOS 6**