diff --git a/Documentation/Routers/ReadWriteSplit.md b/Documentation/Routers/ReadWriteSplit.md
index d6440fd72..ec2aca92e 100644
--- a/Documentation/Routers/ReadWriteSplit.md
+++ b/Documentation/Routers/ReadWriteSplit.md
@@ -352,7 +352,9 @@ application.
 a useful option to enable if you are using a small number of servers and wish to
 use the master for reads as well.
 
-By default, no reads are sent to the master.
+By default, no reads are sent to the master as long as there is a valid slave
+server available. If no slaves are available, reads are sent to the master
+regardless of the value of `master_accept_reads`.
 
 ```
 # Use the master for reads