diff --git a/docs/messaging.rst b/docs/messaging.rst
index bbcce27dc..595cefac5 100644
--- a/docs/messaging.rst
+++ b/docs/messaging.rst
@@ -1457,17 +1457,18 @@ Frontends claiming to implement protocol 5.2 **MUST** identify cursor_pos as the
 Kernels may choose to expect the UTF-16 offset from requests implementing protocol 5.1 and earlier, in order to behave correctly with the most popular frontends.
 But they should know that doing so *introduces* the inverse bug for the frontends that do not have this bug.
 
+As an example, use a python3 kernel and evaluate ``𨭎𨭎𨭎𨭎𨭎 = 10``.  Then type ``𨭎𨭎`` followed by the tab key and see if it properly completes.
+
 Known affected frontends (as of 2017-06):
 
 - Jupyter Notebook < 5.1
 - JupyterLab < 0.24
 - nteract < 0.2.0
-- CoCalc
 - Jupyter Console and QtConsole with Python 2 on macOS and Windows
 
 Known *not* affected frontends:
 
-- QtConsole, Jupyter Console with Python 3 or Python 2 on Linux
+- QtConsole, Jupyter Console with Python 3 or Python 2 on Linux, CoCalc
 
 .. seealso::