diff --git a/HISTORY b/HISTORY
index 7c6dc8dc..acaf65f8 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,4 +1,4 @@
-5.1     2020-??-??
+5.1.0   2020-04-13
         repmgr: remove BDR 2.x support
         repmgr: don't query upstream's data directory (Ian)
         repmgr: rename --recovery-conf-only to --replication-conf-only (Ian)
diff --git a/doc/appendix-release-notes.xml b/doc/appendix-release-notes.xml
index a948ee43..168add5c 100644
--- a/doc/appendix-release-notes.xml
+++ b/doc/appendix-release-notes.xml
@@ -17,12 +17,12 @@
 
 <!-- remember to update the release date in ../repmgr_version.h.in -->
 
-  <sect1 id="release-5.1">
-    <title>Release 5.1</title>
-    <para><emphasis>?? ?? ??, 2020</emphasis></para>
+  <sect1 id="release-5.1-0">
+    <title>Release 5.1.0</title>
+    <para><emphasis>Mon 13 April, 2020</emphasis></para>
 
     <para>
-      &repmgr; 5.1 is a major release.
+      &repmgr; 5.1.0 is a major release.
     </para>
     <para>
       For details on how to upgrade an existing &repmgr; installation, see