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diff --git a/lib/observer/doc/src/notes.xml b/lib/observer/doc/src/notes.xml
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--- a/lib/observer/doc/src/notes.xml
+++ b/lib/observer/doc/src/notes.xml
@@ -32,6 +32,68 @@
<p>This document describes the changes made to the Observer
application.</p>
+<section><title>Observer 2.2.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Fixed a crash happening when observing another node, who
+ have a different number of schedulers than the current
+ one.</p>
+ <p>
+ Own Id: OTP-13702 Aux Id: ERL-171 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
+<section><title>Observer 2.2</title>
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Update observer GUI to support tracing on ports, and to
+ set matchspecs for send/receive. This required some minor
+ bugfixes in runtime_tools/dbg.</p>
+ <p>
+ Own Id: OTP-13481</p>
+ </item>
+ <item>
+ <p>
+ Update dbg and ttb to work with a tracer module as tracer
+ and tracing on ports.</p>
+ <p>
+ Own Id: OTP-13500</p>
+ </item>
+ <item>
+ <p>
+ Added possibility to change update frequency and length
+ of the graph windows.</p>
+ <p>
+ Own Id: OTP-13555</p>
+ </item>
+ <item>
+ <p>
+ Improved background coloring to work with dark themes and
+ other visual improvements.</p>
+ <p>
+ Own Id: OTP-13556</p>
+ </item>
+ <item>
+ <p>
+ Crashdump viewer now allows port info "Port controls
+ forker process..."</p>
+ <p>
+ Own Id: OTP-13647</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Observer 2.1.2</title>
<section><title>Improvements and New Features</title>