diff --git a/changes/changelog.d/770.doc b/changes/changelog.d/770.doc
new file mode 100644
index 0000000000000000000000000000000000000000..4f419f20906586ac00af7da0916647e7c8854c0e
--- /dev/null
+++ b/changes/changelog.d/770.doc
@@ -0,0 +1 @@
+Document how to use Redis over unix sockets (#770)
diff --git a/deploy/env.prod.sample b/deploy/env.prod.sample
index 1f09046ce84a3992990184865248134affb4e896..9fd1720494f7c891c55bdcb0965651f1df2453b0 100644
--- a/deploy/env.prod.sample
+++ b/deploy/env.prod.sample
@@ -75,7 +75,15 @@ REVERSE_PROXY_TYPE=nginx
 #  CACHE_URL=redis://:password@localhost:6379/0
 #  (the extra semicolon is important)
 # Use the next one if you followed Debian installation guide
+#
 # CACHE_URL=redis://127.0.0.1:6379/0
+#
+# If you want to use Redis over unix sockets, you'll actually need two variables:
+# For the cache part:
+#  CACHE_URL=redis:///run/redis/redis.sock?db=0
+# For the Celery/asynchronous tasks part:
+#  CELERY_BROKER_URL=redis+socket:///run/redis/redis.sock?virtual_host=0
+
 
 # Where media files (such as album covers or audio tracks) should be stored
 # on your system?