diff --git a/introduction/welcome/changelog.xml b/introduction/welcome/changelog.xml
index 3081d92572..7d2ce38ae3 100644
--- a/introduction/welcome/changelog.xml
+++ b/introduction/welcome/changelog.xml
@@ -41,6 +41,15 @@
       </itemizedlist>
     </listitem>
     -->
+    <listitem>
+      <para>January 5th, 2022</para>
+      <itemizedlist>
+        <listitem>
+          <para>[pierre] - Patch exim for building against openssl-3.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
+
     <listitem>
       <para>January 4th, 2022</para>
       <itemizedlist>
diff --git a/server/mail/exim.xml b/server/mail/exim.xml
index f7ae778a45..6e5751c208 100644
--- a/server/mail/exim.xml
+++ b/server/mail/exim.xml
@@ -90,6 +90,12 @@
           <ulink url="&patch-root;/exim-&exim-version;-call_pam-1.patch"/>
         </para>
       </listitem>
+      <listitem>
+        <para>
+          Required patch to build with openssl-3:
+          <ulink url="&patch-root;/exim-&exim-version;-openssl3_fix-1.patch"/>
+        </para>
+      </listitem>
     </itemizedlist>
 
     <bridgehead renderas="sect3">Exim Dependencies</bridgehead>
@@ -142,6 +148,12 @@ useradd -d /dev/null -c "Exim Daemon" -g exim -s /bin/false -u 31 exim</userinpu
 
 <screen><userinput>patch -Np2 -i ../exim-&exim-version;-call_pam-1.patch</userinput></screen>
 
+    <para>
+      Apply a patch required for building against openssl version 3:
+    </para>
+
+<screen><userinput>patch -Np2 -i ../exim-&exim-version;-openssl3_fix-1.patch</userinput></screen>
+
     <para>
       Configure <application>Exim</application> with the following commands:
     </para>