diff --git a/content/doc/metrics/blackfire.md b/content/doc/metrics/blackfire.md
index 85453fbe..29ed329c 100644
--- a/content/doc/metrics/blackfire.md
+++ b/content/doc/metrics/blackfire.md
@@ -24,6 +24,7 @@ Blackfire can be used on Clever Cloud with **PHP** applications.
 
 ### Necessary information
 
+Your PHP version must be 7.4 or higher.  
 Before setting up your app, be sure to have a [Blackfire Account](https://www.blackfire.io/).
 
 ### Configuration