diff --git a/fastapi/applications.py b/fastapi/applications.py
index 58d5b268a..cae292f37 100644
--- a/fastapi/applications.py
+++ b/fastapi/applications.py
@@ -823,7 +823,7 @@ class FastAPI(Starlette):
                 One of them will result in a 307-redirect.
 
                 It's important to understand that when `ignore_trailing_slash=True`, registering both `/auth`
-                and `/auth/` as different routes will be treated as if `/auth` was registered twice. 
+                and `/auth/` as different routes will be treated as if `/auth` was registered twice.
                 This means that only the first route registered will be used.
                 Therefore, ensure your route setup does not conflict unintentionally.
                 """
diff --git a/fastapi/routing.py b/fastapi/routing.py
index cec5075e8..31db7ebef 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -844,7 +844,7 @@ class APIRouter(routing.Router):
                 One of them will result in a 307-redirect.
 
                 It's important to understand that when `ignore_trailing_slash=True`, registering both `/auth`
-                and `/auth/` as different routes will be treated as if `/auth` was registered twice. 
+                and `/auth/` as different routes will be treated as if `/auth` was registered twice.
                 This means that only the first route registered will be used.
                 Therefore, ensure your route setup does not conflict unintentionally.
                 """