diff --git a/installer/data/mysql/atomicupdate/bug18591-ill-comments.perl b/installer/data/mysql/atomicupdate/bug18591-ill-comments.perl
new file mode 100644
index 0000000000..574211883a
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug18591-ill-comments.perl
@@ -0,0 +1,26 @@
+$DBversion = 'XXX';
+if( CheckVersion( $DBversion ) ) {
+    unless (TableExists('illcomments')) {
+        $dbh->do(q{
+            CREATE TABLE illcomments (
+                illcomment_id int(11) NOT NULL AUTO_INCREMENT, -- Unique ID of the comment
+                illrequest_id bigint(20) unsigned NOT NULL,    -- ILL request number
+                borrowernumber integer DEFAULT NULL,           -- Link to the user who made the comment (could be librarian, patron or ILL partner library)
+                comment text DEFAULT NULL,                     -- The text of the comment
+                timestamp timestamp DEFAULT CURRENT_TIMESTAMP, -- Date and time when the comment was made
+                PRIMARY KEY  ( illcomment_id ),
+                CONSTRAINT illcomments_bnfk
+                  FOREIGN KEY ( borrowernumber )
+                  REFERENCES  borrowers  ( borrowernumber )
+                  ON UPDATE CASCADE ON DELETE CASCADE,
+                CONSTRAINT illcomments_ifk
+                  FOREIGN KEY (illrequest_id)
+                  REFERENCES illrequests ( illrequest_id )
+                  ON UPDATE CASCADE ON DELETE CASCADE
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+        });
+    }
+
+    SetVersion( $DBversion );
+    print "Upgrade to $DBversion done (Bug 18591 - Add comments to ILL requests)\n";
+}
diff --git a/installer/data/mysql/kohastructure.sql b/installer/data/mysql/kohastructure.sql
index 383ea48d1f..62c0dcecfb 100644
--- a/installer/data/mysql/kohastructure.sql
+++ b/installer/data/mysql/kohastructure.sql
@@ -4222,6 +4222,28 @@ CREATE TABLE `oauth_access_tokens` (
     PRIMARY KEY (`access_token`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+--
+-- Table structure for table illcomments
+--
+
+DROP TABLE IF EXISTS `illcomments`;
+CREATE TABLE illcomments (
+    illcomment_id int(11) NOT NULL AUTO_INCREMENT, -- Unique ID of the comment
+    illrequest_id bigint(20) unsigned NOT NULL,    -- ILL request number
+    borrowernumber integer DEFAULT NULL,           -- Link to the user who made the comment (could be librarian, patron or ILL partner library)
+    comment text DEFAULT NULL,                     -- The text of the comment
+    timestamp timestamp DEFAULT CURRENT_TIMESTAMP, -- Date and time when the comment was made
+    PRIMARY KEY  ( illcomment_id ),
+    CONSTRAINT illcomments_bnfk
+      FOREIGN KEY ( borrowernumber )
+      REFERENCES  borrowers  ( borrowernumber )
+      ON UPDATE CASCADE ON DELETE CASCADE,
+    CONSTRAINT illcomments_ifk
+      FOREIGN KEY (illrequest_id)
+      REFERENCES illrequests ( illrequest_id )
+      ON UPDATE CASCADE ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
 --
 -- Table structure for table `circulation_rules`
 --