diff --git a/introduction/welcome/changelog.xml b/introduction/welcome/changelog.xml
index e0cb08b448..068721f6e5 100644
--- a/introduction/welcome/changelog.xml
+++ b/introduction/welcome/changelog.xml
@@ -46,6 +46,10 @@
     <listitem>
       <para>August 19th, 2013</para>
       <itemizedlist>
+        <listitem>
+          <para>[fernando] - Xulrunner: tweaks, note for memory used for building.
+          </para>
+        </listitem>
         <listitem>
           <para>[ken] - Add sed to postfix to compile with current BerkeleyDB.
           </para>
diff --git a/x/lib/xulrunner.xml b/x/lib/xulrunner.xml
index faee5d6106..0204ca475d 100644
--- a/x/lib/xulrunner.xml
+++ b/x/lib/xulrunner.xml
@@ -11,7 +11,7 @@
   <!ENTITY xulrunner-md5sum        "0fa25582fb5e0fba37c9f1add8370af2">
   <!ENTITY xulrunner-size          "111 MB">
   <!ENTITY xulrunner-buildsize     "4.9 GB (89 MB installed)">
-  <!ENTITY xulrunner-time          "56 SBU">
+  <!ENTITY xulrunner-time          "94 SBU">
 ]>
 
 <sect1 id="xulrunner" xreflabel="Xulrunner-&xulrunner-version;">
@@ -194,8 +194,15 @@ ac_add_options --with-system-zlib
 mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/xulrunner-build-dir
 EOF</userinput></screen>
 
+    <note>
+      <para>
+        <application>Xulrunner</application>'s build uses large amount of
+        memory. On some systems, the RAM/Swap combination needs 6 GB available.
+      </para>
+    </note>
+
     <para>
-      Install <application>Xulrunner</application> by issuing the following
+      Build <application>Xulrunner</application> by issuing the following
       commands:
     </para>
 
@@ -206,7 +213,7 @@ EOF</userinput></screen>
     </para>
 
     <para>
-      Now, as the <systemitem class="username">root</systemitem> user:
+      Install, as the <systemitem class="username">root</systemitem> user:
     </para>
 
 <screen role="root"><userinput>make -C xulrunner-build-dir install &amp;&amp;