Added a section called "Validating packages".
git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1626489 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/BUILDING.txt b/BUILDING.txt
index da5d0f7..3e0eb83 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -32,7 +32,17 @@
where <VERSION> is the release version
-(4) Building documentation
+(4) Validating packages
+
+Check for binary compatibility with the previous version with:
+
+mvn clirr:check
+
+Check for proper license headers with:
+
+mvn apache-rat:check
+
+(5) Building documentation
Execute the following commands in order to generate Javadoc:
