diff --git a/documentation/adt-manual/adt-manual.xml b/documentation/adt-manual/adt-manual.xml
index 0c917616f9..b0fa07e6db 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>Sometime in 2013</date>
+                <date>February 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 4f15f0dc87..bbf0f9ff39 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>Sometime in 2013</date>
+                <date>February 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 43b6400022..4e85fc7be9 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>Sometime in 2013</date>
+                <date>February 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 219083863f..1d785e958e 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>Sometime in 2013</date>
+                <date>February 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 dab58e4060..b03bad1874 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>Sometime in 2013</date>
+                <date>February 2013</date>
                 <revremark>Released with the Yocto Project 1.3.1 Release.</revremark>
             </revision>
         </revhistory>