diff --git a/README.md b/README.md
index a79c506..798e17e 100644
--- a/README.md
+++ b/README.md
@@ -169,7 +169,7 @@ There are some configs you need to change in the files below
 | HMD_LDAP_TOKENSECRET | `supersecretkey` | secret used for generating access/refresh tokens |
 | HMD_LDAP_SEARCHBASE | `o=users,dc=example,dc=com` | LDAP directory to begin search from |
 | HMD_LDAP_SEARCHFILTER | `(uid={{username}})` | LDAP filter to search with |
-| HMD_LDAP_SEARCHATTRIBUTES | no example | LDAP attributes to search with |
+| HMD_LDAP_SEARCHATTRIBUTES | `displayName, mail` | LDAP attributes to search with (use comma to separate) |
 | HMD_LDAP_USERNAMEFIELD | `uid` | The LDAP field which is used as the username on HackMD |
 | HMD_LDAP_TLS_CA | `server-cert.pem, root.pem` | Root CA for LDAP TLS in PEM format (use comma to separate) |
 | HMD_LDAP_PROVIDERNAME | `My institution` | Optional name to be displayed at login form indicating the LDAP provider |
@@ -289,7 +289,7 @@ See more at [http://operational-transformation.github.io/](http://operational-tr
 
 # License
 
-**License under MIT.**
+**License under AGPL.**
 
 [gitter-image]: https://badges.gitter.im/Join%20Chat.svg
 [gitter-url]: https://gitter.im/hackmdio/hackmd?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
diff --git a/config.json.example b/config.json.example
index 401de38..b243bf8 100644
--- a/config.json.example
+++ b/config.json.example
@@ -70,7 +70,7 @@
             "tokenSecret": "change this",
             "searchBase": "change this",
             "searchFilter": "change this",
-            "searchAttributes": "change this",
+            "searchAttributes": ["change this"],
             "usernameField": "change this e.g. uid"
             "tlsOptions": {
                 "changeme": "See https://nodejs.org/api/tls.html#tls_tls_connect_options_callback"
diff --git a/lib/config/environment.js b/lib/config/environment.js
index d1b2684..27e6359 100644
--- a/lib/config/environment.js
+++ b/lib/config/environment.js
@@ -1,6 +1,6 @@
 'use strict'
 
-const {toBooleanConfig} = require('./utils')
+const {toBooleanConfig, toArrayConfig} = require('./utils')
 
 module.exports = {
   domain: process.env.HMD_DOMAIN,
@@ -15,7 +15,7 @@ module.exports = {
     preload: toBooleanConfig(process.env.HMD_HSTS_PRELOAD)
   },
   protocolusessl: toBooleanConfig(process.env.HMD_PROTOCOL_USESSL),
-  alloworigin: process.env.HMD_ALLOW_ORIGIN ? process.env.HMD_ALLOW_ORIGIN.split(',') : undefined,
+  alloworigin: toArrayConfig(process.env.HMD_ALLOW_ORIGIN),
   usecdn: toBooleanConfig(process.env.HMD_USECDN),
   allowanonymous: toBooleanConfig(process.env.HMD_ALLOW_ANONYMOUS),
   allowfreeurl: toBooleanConfig(process.env.HMD_ALLOW_FREEURL),
@@ -70,7 +70,7 @@ module.exports = {
     tokenSecret: process.env.HMD_LDAP_TOKENSECRET,
     searchBase: process.env.HMD_LDAP_SEARCHBASE,
     searchFilter: process.env.HMD_LDAP_SEARCHFILTER,
-    searchAttributes: process.env.HMD_LDAP_SEARCHATTRIBUTES,
+    searchAttributes: toArrayConfig(process.env.HMD_LDAP_SEARCHATTRIBUTES),
     usernameField: process.env.HMD_LDAP_USERNAMEFIELD,
     tlsca: process.env.HMD_LDAP_TLS_CA
   },
@@ -80,8 +80,8 @@ module.exports = {
     issuer: process.env.HMD_SAML_ISSUER,
     identifierFormat: process.env.HMD_SAML_IDENTIFIERFORMAT,
     groupAttribute: process.env.HMD_SAML_GROUPATTRIBUTE,
-    externalGroups: process.env.HMD_SAML_EXTERNALGROUPS ? process.env.HMD_SAML_EXTERNALGROUPS.split('|') : [],
-    requiredGroups: process.env.HMD_SAML_REQUIREDGROUPS ? process.env.HMD_SAML_REQUIREDGROUPS.split('|') : [],
+    externalGroups: toArrayConfig(process.env.HMD_SAML_EXTERNALGROUPS, '|', []),
+    requiredGroups: toArrayConfig(process.env.HMD_SAML_REQUIREDGROUPS, '|', []),
     attribute: {
       id: process.env.HMD_SAML_ATTRIBUTE_ID,
       username: process.env.HMD_SAML_ATTRIBUTE_USERNAME,
diff --git a/lib/config/utils.js b/lib/config/utils.js
index 11bbd8c..9ff2f96 100644
--- a/lib/config/utils.js
+++ b/lib/config/utils.js
@@ -6,3 +6,10 @@ exports.toBooleanConfig = function toBooleanConfig (configValue) {
   }
   return configValue
 }
+
+exports.toArrayConfig = function toArrayConfig (configValue, separator = ',', fallback) {
+  if (configValue && typeof configValue === 'string') {
+    return (configValue.split(separator).map(arrayItem => arrayItem.trim()))
+  }
+  return fallback
+}