diff --git a/README.md b/README.md
index de5f7cb9..036e90ee 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ The following products must be installed:
 
     * OpenJDK 11 or higher
     * Maven 3.x or higher ([http://maven.apache.org/])
+    * npm 6 or higher ([https://www.npmjs.com/package/npm?activeTab=versions])
 
 ### Compiling