diff --git a/docs/user-manual/en/building.adoc b/docs/user-manual/en/building.adoc
index 1e3ed34081fa6..69d45089f6371 100644
--- a/docs/user-manual/en/building.adoc
+++ b/docs/user-manual/en/building.adoc
@@ -14,7 +14,8 @@ Prequisites
 
 * Download and http://maven.apache.org/download.html[install Maven] +
  (Maven 3.1.1 or newer is required to build Camel 2.14 onwards) +
-(Maven 3.2.5 or newer is required to build Camel 2.18 onwards) 
+(Maven 3.2.5 or newer is required to build Camel 2.18 onwards) +
+(Maven 3.3.3 or newer is required to build Camel 2.20 onwards)
 * Get the latest link:source.html[Source]
 * Java 
 (1.7 or 1.8 to build Camel 2.14 onwards)