diff --git a/composer.json b/composer.json
index ea23a808..67060367 100644
--- a/composer.json
+++ b/composer.json
@@ -10,9 +10,9 @@
         "phpunit/phpunit": "~4.8"
     },
     "suggest": {
-        "ext-libevent": ">=0.1.0",
-        "ext-event": "~1.0",
-        "ext-libev": "*",
+        "ext-libevent": ">=0.1.0 for LibEventLoop and PHP5 only",
+        "ext-event": "~1.0 for ExtEventLoop",
+        "ext-libev": "for LibEvLoop",
         "ext-pcntl": "For signals support when using the stream_select loop"
     },
     "autoload": {