diff --git a/plinth/modules/bind/__init__.py b/plinth/modules/bind/__init__.py
index 213b5b401..ff34d927e 100644
--- a/plinth/modules/bind/__init__.py
+++ b/plinth/modules/bind/__init__.py
@@ -72,5 +72,6 @@ class BindApp(app_module.App):
 
     def force_upgrade(self, _packages):
         """Force upgrade the managed packages to resolve conffile prompt."""
+        # Allow upgrades nay new version by keeping old configuration files
         install(['bind9'], force_configuration='old')
         return True
diff --git a/plinth/modules/firewall/__init__.py b/plinth/modules/firewall/__init__.py
index cc16c659e..038091eb4 100644
--- a/plinth/modules/firewall/__init__.py
+++ b/plinth/modules/firewall/__init__.py
@@ -88,7 +88,7 @@ class FirewallApp(app_module.App):
         if 'firewalld' not in packages:
             return False
 
-        # Allow upgrade from any version to any version below 3.0
+        # Allow upgrade from 1.3.3 (bookworm) to 2.3.0 (trixie) and beyond 2.x.
         package = packages['firewalld']
         if Version(package['new_version']) > Version('3~'):
             return False
diff --git a/plinth/modules/minidlna/__init__.py b/plinth/modules/minidlna/__init__.py
index 2d27309ee..47d9383ce 100644
--- a/plinth/modules/minidlna/__init__.py
+++ b/plinth/modules/minidlna/__init__.py
@@ -109,7 +109,8 @@ class MiniDLNAApp(app_module.App):
         if 'minidlna' not in packages:
             return False
 
-        # Allow upgrade from 1.2.1+dfsg-1+b1 to 1.3.x
+        # Allow upgrade from 1.3.0 (bookworm) to 1.3.3 (trixie) and beyond
+        # 1.3.x.
         package = packages['minidlna']
         if Version(package['new_version']) > Version('1.4~'):
             return False
diff --git a/plinth/modules/mumble/__init__.py b/plinth/modules/mumble/__init__.py
index a7ebcf310..ad7592f13 100644
--- a/plinth/modules/mumble/__init__.py
+++ b/plinth/modules/mumble/__init__.py
@@ -106,7 +106,8 @@ class MumbleApp(app_module.App):
         if 'mumble-server' not in packages:
             return False
 
-        # Allow upgrades within 1.3.*
+        # Allow upgrades from 1.3.4-1 (bullseye) to 1.3.4-4 (bookworm) but not
+        # to 1.5.735 (trixie) and beyond.
         package = packages['mumble-server']
         if Version(package['new_version']) > Version('1.4~'):
             return False
diff --git a/plinth/modules/radicale/__init__.py b/plinth/modules/radicale/__init__.py
index cc312ac98..3ba77f71c 100644
--- a/plinth/modules/radicale/__init__.py
+++ b/plinth/modules/radicale/__init__.py
@@ -110,7 +110,7 @@ class RadicaleApp(app_module.App):
         if 'radicale' not in packages:
             return False
 
-        # Allow upgrade from 2.* to newer 2.* and 3.*
+        # Allow upgrade from 3.1.8 (bookworm) to 3.4.1 (trixie) and beyond 3.x.
         package = packages['radicale']
         if Version(package['new_version']) > Version('4~'):
             return False
diff --git a/plinth/modules/roundcube/__init__.py b/plinth/modules/roundcube/__init__.py
index cc3ab1040..0287064a5 100644
--- a/plinth/modules/roundcube/__init__.py
+++ b/plinth/modules/roundcube/__init__.py
@@ -111,7 +111,8 @@ class RoundcubeApp(app_module.App):
             return False
 
         # Allow roundcube any version to upgrade to any version. This is okay
-        # because there will no longer be conflicting file changes.
+        # because there will no longer be conflicting file changes after
+        # upgrade from bullseye to bookworm.
         install(['roundcube-core'], force_configuration='new')
         if self.get_component('webserver-roundcube').is_enabled():
             self.get_component('webserver-roundcube-freedombox').enable()
diff --git a/plinth/modules/upgrades/distupgrade.py b/plinth/modules/upgrades/distupgrade.py
index c782b5e3d..7eca2caa2 100644
--- a/plinth/modules/upgrades/distupgrade.py
+++ b/plinth/modules/upgrades/distupgrade.py
@@ -17,10 +17,7 @@ SOURCES_LIST = '/etc/apt/sources.list'
 
 DIST_UPGRADE_OBSOLETE_PACKAGES: list[str] = []
 
-DIST_UPGRADE_PACKAGES_WITH_PROMPTS = [
-    'bind9', 'firewalld', 'janus', 'minetest-server', 'minidlna',
-    'mumble-server', 'radicale', 'roundcube-core', 'tt-rss'
-]
+DIST_UPGRADE_PACKAGES_WITH_PROMPTS = ['firewalld', 'minidlna', 'radicale']
 
 DIST_UPGRADE_PRE_DEBCONF_SELECTIONS: list[str] = [
     # Tell grub-pc to continue without installing grub again.