diff --git a/docs/deployment.md b/docs/deployment.md
index 65163b526..b7c2e6fab 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -33,7 +33,8 @@ Usage: uvicorn [OPTIONS] APP
 Options:
   --host TEXT                     Bind socket to this host.  [default:
                                   127.0.0.1]
-  --port INTEGER                  Bind socket to this port.  [default: 8000]
+  --port INTEGER                  Bind socket to this port. If 0, an available
+                                  port will be picked.  [default: 8000]
   --uds TEXT                      Bind to a UNIX domain socket.
   --fd INTEGER                    Bind to socket from this file descriptor.
   --reload                        Enable auto-reload.
diff --git a/docs/index.md b/docs/index.md
index 300a318f6..e2ec3d866 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -100,7 +100,8 @@ Usage: uvicorn [OPTIONS] APP
 Options:
   --host TEXT                     Bind socket to this host.  [default:
                                   127.0.0.1]
-  --port INTEGER                  Bind socket to this port.  [default: 8000]
+  --port INTEGER                  Bind socket to this port. If 0, an available
+                                  port will be picked.  [default: 8000]
   --uds TEXT                      Bind to a UNIX domain socket.
   --fd INTEGER                    Bind to socket from this file descriptor.
   --reload                        Enable auto-reload.
diff --git a/uvicorn/main.py b/uvicorn/main.py
index 95e62a41c..d4fe3bbf4 100644
--- a/uvicorn/main.py
+++ b/uvicorn/main.py
@@ -71,7 +71,7 @@ def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> No
     "--port",
     type=int,
     default=8000,
-    help="Bind socket to this port.",
+    help="Bind socket to this port. If 0, an available port will be picked.",
     show_default=True,
 )
 @click.option("--uds", type=str, default=None, help="Bind to a UNIX domain socket.")