diff --git a/units/http-daemon.target b/units/http-daemon.target
index bd7a1ef0d..45f10182e 100644
--- a/units/http-daemon.target
+++ b/units/http-daemon.target
@@ -7,5 +7,8 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=Web Server
diff --git a/units/mail-transfer-agent.target b/units/mail-transfer-agent.target
index 2640076d6..ebb1ea125 100644
--- a/units/mail-transfer-agent.target
+++ b/units/mail-transfer-agent.target
@@ -7,5 +7,8 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=Mail Transfer Agent
diff --git a/units/nss-lookup.target b/units/nss-lookup.target
index 3158441b2..dc3a06334 100644
--- a/units/nss-lookup.target
+++ b/units/nss-lookup.target
@@ -7,6 +7,9 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=Name Lookups
 Wants=network.target
diff --git a/units/rpcbind.target b/units/rpcbind.target
index 41eb3a507..a5cea8c57 100644
--- a/units/rpcbind.target
+++ b/units/rpcbind.target
@@ -7,5 +7,8 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=RPC Port Mapper
diff --git a/units/rtc-set.target b/units/rtc-set.target
index eabdaf458..df4c40298 100644
--- a/units/rtc-set.target
+++ b/units/rtc-set.target
@@ -7,5 +7,8 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=RTC Set
diff --git a/units/syslog.target b/units/syslog.target
index d5410cf58..8b1626ed5 100644
--- a/units/syslog.target
+++ b/units/syslog.target
@@ -7,5 +7,8 @@
 
 # See systemd.special(7) for details
 
+# This exists mostly for compatibility with SysV/LSB units, and
+# implementations lacking socket/bus activation.
+
 [Unit]
 Description=Syslog