diff --git a/CHANGES.rst b/CHANGES.rst
index 033781fb7..cb258767c 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,6 +7,13 @@ Changes
 Laying the foundations for alterative Postgres database drivers (e.g.
 ``psqlpy``). Thanks to @insani7y and @chandr-andr for their help with this.
 
+.. warning::
+  The SQL generated by Piccolo changed slightly in this release. Aliases used
+  to be like ``"manager$name"`` but now they are like ``"manager.name"``
+  (note ``$`` changed to ``.``). If you are using ``SelectRaw`` in your queries
+  to refer to these columns, then they will need updating. Please let us know
+  if you encounter any other issues.
+
 -------------------------------------------------------------------------------
 
 1.13.1