diff --git a/documentation/dev-manual/dev-manual-start.xml b/documentation/dev-manual/dev-manual-start.xml
index c4296bd4c5..997ae035cd 100644
--- a/documentation/dev-manual/dev-manual-start.xml
+++ b/documentation/dev-manual/dev-manual-start.xml
@@ -69,7 +69,7 @@
                 in the Yocto Project Reference Manual and the wiki page at
                 <ulink url='&YOCTO_WIKI_URL;/wiki/Distribution_Support'>Distribution Support</ulink>.</para>
                 <para>
-                You should also have about 100 gigabytes of free disk space for building images.
+                You should also have about 50 Gbytes of free disk space for building images.
                 </para></listitem>
             <listitem><para><emphasis>Packages:</emphasis>  The OpenEmbedded build system
                 requires that certain packages exist on your development system (e.g. Python 2.6 or 2.7).
diff --git a/documentation/yocto-project-qs/yocto-project-qs.xml b/documentation/yocto-project-qs/yocto-project-qs.xml
index 2c856d5a5c..96e207349d 100644
--- a/documentation/yocto-project-qs/yocto-project-qs.xml
+++ b/documentation/yocto-project-qs/yocto-project-qs.xml
@@ -410,7 +410,7 @@
          <note><para>
              The build process using Sato currently consumes about 50GB of disk space.
              To allow for variations in the build process and for future package expansion, we
-             recommend having at least 100GB of free disk space.
+             recommend having at least 50 Gbytes of free disk space.
          </para></note>
 
          <note>