diff --git a/contrib/systemd/osmo-bts-lc15.service b/contrib/systemd/osmo-bts-lc15.service
index 0266c9ad4..1fe2758fb 100644
--- a/contrib/systemd/osmo-bts-lc15.service
+++ b/contrib/systemd/osmo-bts-lc15.service
@@ -11,9 +11,11 @@ Restart=always
 RestartSec=2
 RestartPreventExitStatus=1
 
-# The msg queues must be read fast enough
+# CPU scheduling policy:
 CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
 CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target
diff --git a/contrib/systemd/osmo-bts-oc2g.service b/contrib/systemd/osmo-bts-oc2g.service
index b0b1f7e24..fbf26081b 100644
--- a/contrib/systemd/osmo-bts-oc2g.service
+++ b/contrib/systemd/osmo-bts-oc2g.service
@@ -11,9 +11,11 @@ Restart=always
 RestartSec=2
 RestartPreventExitStatus=1
 
-# The msg queues must be read fast enough
+# CPU scheduling policy:
 CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
 CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target
diff --git a/contrib/systemd/osmo-bts-sysmo.service b/contrib/systemd/osmo-bts-sysmo.service
index f297cfc82..2a6f71151 100644
--- a/contrib/systemd/osmo-bts-sysmo.service
+++ b/contrib/systemd/osmo-bts-sysmo.service
@@ -13,9 +13,11 @@ Restart=always
 RestartSec=2
 RestartPreventExitStatus=1
 
-# The msg queues must be read fast enough
+# CPU scheduling policy:
 CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
 CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target
diff --git a/contrib/systemd/osmo-bts-trx.service b/contrib/systemd/osmo-bts-trx.service
index e73e7935b..bbfa99cfc 100644
--- a/contrib/systemd/osmo-bts-trx.service
+++ b/contrib/systemd/osmo-bts-trx.service
@@ -9,9 +9,11 @@ WorkingDirectory=%S/osmocom
 Restart=always
 RestartSec=2
 
-# Let it process messages quickly enough
+# CPU scheduling policy:
 CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
 CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target
diff --git a/contrib/systemd/osmo-bts-virtual.service b/contrib/systemd/osmo-bts-virtual.service
index 877181b71..54d0eb1ae 100644
--- a/contrib/systemd/osmo-bts-virtual.service
+++ b/contrib/systemd/osmo-bts-virtual.service
@@ -9,9 +9,11 @@ WorkingDirectory=%S/osmocom
 Restart=always
 RestartSec=2
 
-# Let it process messages quickly enough
+# CPU scheduling policy:
 CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
 CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target