diff --git a/README.md b/README.md
index d0a9900..0ce306b 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,15 @@ __*__ edit base configuration of openLDAP server
 > vim /etc/ldap/ldap.conf
 ```
 
+__*__ add core ldap schemas in case the base config doesn't
+```
+# ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/ldap/schema/core.ldif
+SASL/EXTERNAL authentication started
+SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
+SASL SSF: 0
+adding new entry "cn=core,cn=schema,cn=config"
+```
+
 create a **password** for openLDAP root user
 ```
 > slappasswd