diff --git a/nixos/modules/system/boot/systemd/coredump.nix b/nixos/modules/system/boot/systemd/coredump.nix
index a437da68c97..b6ee2cff1f9 100644
--- a/nixos/modules/system/boot/systemd/coredump.nix
+++ b/nixos/modules/system/boot/systemd/coredump.nix
@@ -30,7 +30,6 @@ in {
 
   config = {
     systemd.additionalUpstreamSystemUnits = [
-      # Coredumps.
       "systemd-coredump.socket"
       "systemd-coredump@.service"
     ];
diff --git a/nixos/modules/system/boot/systemd/journald.nix b/nixos/modules/system/boot/systemd/journald.nix
index 41a711855ca..7e14c8ae407 100644
--- a/nixos/modules/system/boot/systemd/journald.nix
+++ b/nixos/modules/system/boot/systemd/journald.nix
@@ -82,7 +82,6 @@ in {
 
   config = {
     systemd.additionalUpstreamSystemUnits = [
-      # Journal.
       "systemd-journald.socket"
       "systemd-journald@.socket"
       "systemd-journald-varlink@.socket"
diff --git a/nixos/modules/system/boot/systemd/logind.nix b/nixos/modules/system/boot/systemd/logind.nix
index c02813760b5..c1e6cfe61d0 100644
--- a/nixos/modules/system/boot/systemd/logind.nix
+++ b/nixos/modules/system/boot/systemd/logind.nix
@@ -78,7 +78,6 @@ in
 
   config = {
     systemd.additionalUpstreamSystemUnits = [
-      # Login stuff.
       "systemd-logind.service"
       "autovt@.service"
       "systemd-user-sessions.service"
diff --git a/nixos/modules/system/boot/systemd/tmpfiles.nix b/nixos/modules/system/boot/systemd/tmpfiles.nix
index 874246cb9c4..57d44c8591e 100644
--- a/nixos/modules/system/boot/systemd/tmpfiles.nix
+++ b/nixos/modules/system/boot/systemd/tmpfiles.nix
@@ -42,7 +42,6 @@ in
 
   config = {
     systemd.additionalUpstreamSystemUnits = [
-      # Temporary file creation / cleanup.
       "systemd-tmpfiles-clean.service"
       "systemd-tmpfiles-clean.timer"
       "systemd-tmpfiles-setup.service"