diff --git a/README.md b/README.md
index 6bca0f5..9c8a8da 100755
--- a/README.md
+++ b/README.md
@@ -26,6 +26,10 @@ install dependencies with Composer
 
 there are examples of request to make it all work in the [doc/examples.md](doc/examples.md).
 
+### Check prerequisites
+```bash
+composer check-platform-reqs
+```
 
 ### install the vendors
 ```bash
diff --git a/composer.json b/composer.json
index f13b676..447f112 100755
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,7 @@
     "ext-ctype": "*",
     "ext-iconv": "*",
     "ext-json": "*",
+    "ext-pdo_mysql": "*",
     "friendsofsymfony/rest-bundle": "^2.6",
     "jms/serializer-bundle": "^3.4",
     "nelmio/api-doc-bundle": "^3.4",