add a comment about common.xml


Revision created by MOE tool push_codebase.
MOE_MIGRATION=2442


git-svn-id: https://google-guice.googlecode.com/svn/trunk@1567 d779f126-a31b-0410-b53b-1d3aecad763e
diff --git a/build.xml b/build.xml
index 1ff9a51..d31b205 100644
--- a/build.xml
+++ b/build.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0"?>
 
 <project name="guice" default="compile">
+  <!-- common definitions are stored in common.xml. -->
   <import file="common.xml"/>
 
   <path id="compile.classpath">