Update manhole documentation for async/await. (#8462)

2 files changed, 6 insertions, 2 deletions

diff --git a/changelog.d/8462.doc b/changelog.d/8462.doc
new file mode 100644

index 0000000000..cf84db6db7
--- /dev/null
+++ b/changelog.d/8462.doc
@@ -0,0 +1 @@
+Update the directions for using the manhole with coroutines.
diff --git a/docs/manhole.md b/docs/manhole.md

index 7375f5ad46..75b6ae40e0 100644
--- a/docs/manhole.md
+++ b/docs/manhole.md
@@ -35,9 +35,12 @@ This gives a Python REPL in which `hs` gives access to the
 `synapse.server.HomeServer` object - which in turn gives access to many other
 parts of the process.
 
+Note that any call which returns a coroutine will need to be wrapped in `ensureDeferred`.
+
 As a simple example, retrieving an event from the database:
 
-```
->>> hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org')
+```pycon
+>>> from twisted.internet import defer
+>>> defer.ensureDeferred(hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org'))
 <Deferred at 0x7ff253fc6998 current result: <FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''>>
 ```