diff --git a/documentation/adt-manual/adt-manual.xml b/documentation/adt-manual/adt-manual.xml
index d5722f1b82..2447e2c37b 100644
--- a/documentation/adt-manual/adt-manual.xml
+++ b/documentation/adt-manual/adt-manual.xml
@@ -56,7 +56,7 @@
             </revision>
             <revision>
                 <revnumber>1.3.1</revnumber>
-                <date>March 2013</date>
+                <date>April 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>
diff --git a/documentation/bsp-guide/bsp-guide.xml b/documentation/bsp-guide/bsp-guide.xml
index 1c98990195..b61134355f 100644
--- a/documentation/bsp-guide/bsp-guide.xml
+++ b/documentation/bsp-guide/bsp-guide.xml
@@ -68,7 +68,7 @@
             </revision>
             <revision>
                 <revnumber>1.3.1</revnumber>
-                <date>March 2013</date>
+                <date>April 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>
diff --git a/documentation/dev-manual/dev-manual.xml b/documentation/dev-manual/dev-manual.xml
index 375f0536f8..4e5ff0c454 100644
--- a/documentation/dev-manual/dev-manual.xml
+++ b/documentation/dev-manual/dev-manual.xml
@@ -46,7 +46,7 @@
             </revision>
             <revision>
                 <revnumber>1.3.1</revnumber>
-                <date>March 2013</date>
+                <date>April 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>
diff --git a/documentation/kernel-manual/kernel-manual.xml b/documentation/kernel-manual/kernel-manual.xml
index bdc9478be1..c27139d4bf 100644
--- a/documentation/kernel-manual/kernel-manual.xml
+++ b/documentation/kernel-manual/kernel-manual.xml
@@ -61,7 +61,7 @@
             </revision>
             <revision>
                 <revnumber>1.3.1</revnumber>
-                <date>March 2013</date>
+                <date>April 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>
diff --git a/documentation/poky-ref-manual/poky-ref-manual.xml b/documentation/poky-ref-manual/poky-ref-manual.xml
index 22210ac919..fee7cf376e 100644
--- a/documentation/poky-ref-manual/poky-ref-manual.xml
+++ b/documentation/poky-ref-manual/poky-ref-manual.xml
@@ -62,7 +62,7 @@
             </revision>
             <revision>
                 <revnumber>1.3.1</revnumber>
-                <date>March 2013</date>
+                <date>April 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>