3 files changed, 64 insertions, 1 deletions
diff --git a/lib/snmp/doc/src/notes.xml b/lib/snmp/doc/src/notes.xml
index 6a20d8ee3a..cf9d2b3834 100644
--- a/lib/snmp/doc/src/notes.xml
+++ b/lib/snmp/doc/src/notes.xml
@@ -33,6 +33,57 @@
   </header>
 
   <section>
+    <title>SNMP Development Toolkit 4.20.1</title>
+    <p>Version 4.20.1 supports code replacement in runtime from/to
+      version 4.20, 4.19 and 4.18.</p>
+
+    <section>
+      <title>Improvements and new features</title>
+      <p>-</p>
+<!--
+      <list type="bulleted">
+        <item>
+          <p>Added type specs for functions that do not return. </p>
+          <p>Kostis Sagonas</p>
+          <p>Own Id: OTP-9208</p>
+        </item>
+      </list>
+-->
+    </section>
+
+    <section>
+      <title>Fixed Bugs and Malfunctions</title>
+<!--
+      <p>-</p> 
+-->
+
+      <list type="bulleted">
+        <item>
+          <p>[agent] Did not handle transport domains properly in some cases, 
+	  for instance trap sending. </p>
+	  <p>Own Id: OTP-9400</p>
+	</item>
+
+        <item>
+          <p>[agent] Wrong default transport domain, snmpUDPDomain, instead
+	  of transportDomainUdpIpv4. </p>
+	  <p>Own Id: OTP-9425</p>
+          <p>Aux Id: Seq 11874</p>
+	</item>
+
+      </list>
+    </section>
+
+
+    <section>
+      <title>Incompatibilities</title>
+      <p>-</p>
+    </section>
+
+  </section> <!-- 4.20.1 -->
+
+
+  <section>
     <title>SNMP Development Toolkit 4.20</title>
     <p>Version 4.20 supports code replacement in runtime from/to
       version 4.19 and 4.18.</p>
diff --git a/lib/snmp/src/app/snmp.appup.src b/lib/snmp/src/app/snmp.appup.src
index 5deb40be0f..9d10db67a1 100644
--- a/lib/snmp/src/app/snmp.appup.src
+++ b/lib/snmp/src/app/snmp.appup.src
@@ -22,6 +22,12 @@
 %% ----- U p g r a d e -------------------------------------------------------
 
  [
+  {"4.20", 
+   [
+    {load_module, snmp_target_mib, soft_purge, soft_purge, []}, 
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}
+   ]
+  }, 
   {"4.19", 
    [
     {load_module, snmpa, soft_purge, soft_purge, []}, 
@@ -109,6 +115,12 @@
 %% ------D o w n g r a d e ---------------------------------------------------
 
  [
+  {"4.20", 
+   [
+    {load_module, snmp_target_mib, soft_purge, soft_purge, []}, 
+    {load_module, snmpa_mpd, soft_purge, soft_purge, []}
+   ]
+  }, 
   {"4.19", 
    [
     {load_module, snmpa, soft_purge, soft_purge, []}, 
diff --git a/lib/snmp/vsn.mk b/lib/snmp/vsn.mk
index 29228fc59b..fe3ba2c04a 100644
--- a/lib/snmp/vsn.mk
+++ b/lib/snmp/vsn.mk
@@ -17,6 +17,6 @@
 #
 # %CopyrightEnd%
 
-SNMP_VSN = 4.20
+SNMP_VSN = 4.20.1
 PRE_VSN  =
 APP_VSN  = "snmp-$(SNMP_VSN)$(PRE_VSN)"