diff --git a/README.md b/README.md
index 493d868..50ad7f5 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Yet another Pharo-ObjectiveC bridge, using UnifiedFFI as backend.
 # Install
 While in fact this can be used generically on ObjC, for obvious reasons it has been tested just on macOS :)
 
+**IMPORTANT:** You need Pharo7+ to run this.
+
 ```Smalltalk
 Metacello new 
   repository: 'github://estebanlm/objcbridge/src';