diff --git a/composer.json b/composer.json
index f0442a329..88f71d607 100644
--- a/composer.json
+++ b/composer.json
@@ -1,10 +1,6 @@
 {
   "require": {
     "php": ">=5.6.0",
-    "ext-mysql": "*",
-    "ext-ldap": "*",
-    "ext-mcrypt": "*",
-    "ext-cli": "*",
     "ext-soap": "*",
     "ext-json": "*",
     "ext-zip": "*",
@@ -13,6 +9,14 @@
     "ext-iconv": "*",
     "ext-gd": "*"
   },
+  "suggest": {
+    "ext-libsodium": "Required to use the AttributeEncryptedString.",
+    "ext-openssl": "Can be used as a polyfill if libsodium is not installed",
+    "ext-mcrypt": "Can be used as a polyfill if either libsodium and openssl are not installed (libsodium and openssl are more secure)",
+    "ext-ldap": "Required to use LDAP as an identity provider",
+    "ext-posix": "Not required by the core, but some extensions uses it.",
+    "ext-imap": "Required by the extension \"Mail to ticket automation\""
+  },
   "config": {
     "platform": {
       "php": "5.6.0"