diff --git a/docs/library/uasyncio.rst b/docs/library/uasyncio.rst
index 0abbf8dd8..859d505d7 100644
--- a/docs/library/uasyncio.rst
+++ b/docs/library/uasyncio.rst
@@ -153,9 +153,14 @@ class ThreadSafeFlag
 
 .. method:: ThreadSafeFlag.set()
 
-    Set the flag.  If there is a task waiting on the event, it will be scheduled
+    Set the flag.  If there is a task waiting on the flag, it will be scheduled
     to run.
 
+.. method:: ThreadSafeFlag.clear()
+
+    Clear the flag. This may be used to ensure that a possibly previously-set
+    flag is clear before waiting for it.
+
 .. method:: ThreadSafeFlag.wait()
 
     Wait for the flag to be set.  If the flag is already set then it returns
diff --git a/extmod/uasyncio/event.py b/extmod/uasyncio/event.py
index c48904b98..654ccefa9 100644
--- a/extmod/uasyncio/event.py
+++ b/extmod/uasyncio/event.py
@@ -36,7 +36,7 @@ class Event:
 # MicroPython-extension: This can be set from outside the asyncio event loop,
 # such as other threads, IRQs or scheduler context. Implementation is a stream
 # that asyncio will poll until a flag is set.
-# Note: Unlike Event, this is self-clearing.
+# Note: Unlike Event, this is self-clearing after a wait().
 try:
     import uio
 
@@ -52,6 +52,9 @@ try:
         def set(self):
             self._flag = 1
 
+        def clear(self):
+            self._flag = 0
+
         async def wait(self):
             if not self._flag:
                 yield core._io_queue.queue_read(self)
diff --git a/tests/extmod/uasyncio_threadsafeflag.py b/tests/extmod/uasyncio_threadsafeflag.py
index 4e002a3d2..a8a08d2e9 100644
--- a/tests/extmod/uasyncio_threadsafeflag.py
+++ b/tests/extmod/uasyncio_threadsafeflag.py
@@ -75,5 +75,25 @@ async def main():
     print("wait task")
     await t
 
+    # Flag set, cleared, and set again.
+    print("----")
+    print("set event")
+    flag.set()
+    print("yield")
+    await asyncio.sleep(0)
+    print("clear event")
+    flag.clear()
+    print("yield")
+    await asyncio.sleep(0)
+    t = asyncio.create_task(task(4, flag))
+    print("yield")
+    await asyncio.sleep(0)
+    print("set event")
+    flag.set()
+    print("yield")
+    await asyncio.sleep(0)
+    print("wait task")
+    await t
+
 
 asyncio.run(main())
diff --git a/tests/extmod/uasyncio_threadsafeflag.py.exp b/tests/extmod/uasyncio_threadsafeflag.py.exp
index aef4e479b..757115ac4 100644
--- a/tests/extmod/uasyncio_threadsafeflag.py.exp
+++ b/tests/extmod/uasyncio_threadsafeflag.py.exp
@@ -19,3 +19,14 @@ yield
 task 3
 task 3 done
 wait task
+----
+set event
+yield
+clear event
+yield
+yield
+task 4
+set event
+yield
+wait task
+task 4 done