diff --git a/changelog.d/7591.misc b/changelog.d/7591.misc
new file mode 100644
index 000000000000..17785b1f21ba
--- /dev/null
+++ b/changelog.d/7591.misc
@@ -0,0 +1 @@
+Add comment to systemd example to show postgresql dependency.
diff --git a/contrib/systemd/matrix-synapse.service b/contrib/systemd/matrix-synapse.service
index 813717b032d7..a75407841083 100644
--- a/contrib/systemd/matrix-synapse.service
+++ b/contrib/systemd/matrix-synapse.service
@@ -15,6 +15,9 @@
 
 [Unit]
 Description=Synapse Matrix homeserver
+# If you are using postgresql to persist data, uncomment this line to make sure
+# synapse starts after the postgresql service.
+# After=postgresql.service
 
 [Service]
 Type=notify