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-rw-r--r--docs/tcp_replication.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/tcp_replication.md b/docs/tcp_replication.md
index a0b1d563ff..e3a4634b14 100644
--- a/docs/tcp_replication.md
+++ b/docs/tcp_replication.md
@@ -254,6 +254,11 @@ and they key to invalidate. For example:
 
     > RDATA caches 550953771 ["get_user_by_id", ["@bob:example.com"], 1550574873251]
 
+Alternatively, an entire cache can be invalidated by sending down a `null`
+instead of the key. For example:
+
+    > RDATA caches 550953772 ["get_user_by_id", null, 1550574873252]
+
 However, there are times when a number of caches need to be invalidated
 at the same time with the same key. To reduce traffic we batch those
 invalidations into a single poke by defining a special cache name that