diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index d3abbc3c..568a2bb6 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -118,7 +118,7 @@ class TelegramBaseClient(abc.ABC):
 
         flood_sleep_threshold (`int` | `float`, optional):
             The threshold below which the library should automatically
-            sleep on flood wait errors (inclusive). For instance, if a
+            sleep on flood wait and slowmode wait errors (inclusive). For instance, if a
             ``FloodWaitError`` for 17s occurs and `flood_sleep_threshold`
             is 20s, the library will ``sleep`` automatically. If the error
             was for 21s, it would ``raise FloodWaitError`` instead. Values
diff --git a/telethon/client/users.py b/telethon/client/users.py
index 685f6134..accdba77 100644
--- a/telethon/client/users.py
+++ b/telethon/client/users.py
@@ -82,7 +82,7 @@ class UserMethods:
                     e.__class__.__name__, e)
 
                 await asyncio.sleep(2)
-            except (errors.FloodWaitError, errors.FloodTestPhoneWaitError) as e:
+            except (errors.FloodWaitError, errors.SlowmodeWaitError, errors.FloodTestPhoneWaitError) as e:
                 if utils.is_list_like(request):
                     request = request[request_index]