diff --git a/Documentation/Filters/CCRFilter.md b/Documentation/Filters/CCRFilter.md
index 1672b1e8e..96bdf6cb2 100644
--- a/Documentation/Filters/CCRFilter.md
+++ b/Documentation/Filters/CCRFilter.md
@@ -13,6 +13,9 @@ hint guides the routing module to route the statement to the master server where
 data is guaranteed to be in an up-to-date state. Writes from one session do not,
 by default, propagate to other sessions.
 
+*Note:* This filter does not work with prepared statements. Only text protocol
+ queries are handled by this filter.
+
 ### Controlling the Filter with SQL Comments
 
 The triggering of the filter can be limited further by adding MaxScale supported
diff --git a/Documentation/Routers/ReadWriteSplit.md b/Documentation/Routers/ReadWriteSplit.md
index db894217b..5e6e5a8e7 100644
--- a/Documentation/Routers/ReadWriteSplit.md
+++ b/Documentation/Routers/ReadWriteSplit.md
@@ -564,6 +564,10 @@ modifications done by the client itself.
   addition to this, the `session_track_system_variables` parameter must be set
   to `last_gtid`.
 
+**Note:** This feature does not work with prepared statements. Only SQL
+  statements executed individually (inside a COM_QUERY packet) can be handled by
+  the causal read mechanism.
+
 **Note:** This feature does not work with Galera or any other non-standard
   replication mechanisms. As Galera does not update the `gtid_slave_pos`
   variable when events are replicated via the Galera library, the