diff --git a/docs/en/migration/interface.md b/docs/en/migration/interface.md
index f9a0b86f3d..c816fceafe 100644
--- a/docs/en/migration/interface.md
+++ b/docs/en/migration/interface.md
@@ -146,10 +146,13 @@ Changes in **pipeline**
 - The original formatting transforms **`ToTensor`**、**`ImageToTensor`**、**`Collect`** are combined as [`PackSegInputs`](mmseg.datasets.transforms.PackSegInputs)
 - We don't recommend to do **`Normalize`** and **Pad** in the dataset pipeline. Please remove it from pipelines and set it in the `data_preprocessor` field.
 - The original **`Resize`** in MMSeg 1.x has been changed to **`RandomResize`** and the input arguments `img_scale` is renamed to `scale`, and the default value of `keep_ratio` is modified to False.
+- The original `test_pipeline` combines single-scale test and multi-scale test together, in MMSeg 1.x we separate it into `test_pipeline` and `tta_pipeline`.
 
 **Note:**
 We move some work of data transforms to the data preprocessor, like normalization, see [the documentation](package.md) for more details.
 
+train_pipeline
+
 <table class="docutils">
 <tr>
 <td>Original</td>
@@ -195,6 +198,65 @@ train_pipeline = [
 </tr>
 </table>
 
+test_pipeline
+
+<table class="docutils">
+<tr>
+<td>Original</td>
+<td>
+
+```python
+test_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(
+        type='MultiScaleFlipAug',
+        img_scale=(2560, 640),
+        # img_ratios=[0.5, 0.75, 1.0, 1.25, 1.5, 1.75],
+        flip=False,
+        transforms=[
+            dict(type='Resize', keep_ratio=True),
+            dict(type='RandomFlip'),
+            dict(type='Normalize', **img_norm_cfg),
+            dict(type='ImageToTensor', keys=['img']),
+            dict(type='Collect', keys=['img']),
+        ])
+]
+```
+
+</td>
+<tr>
+<td>New</td>
+<td>
+
+```python
+test_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(type='Resize', scale=(2560, 640), keep_ratio=True),
+    dict(type='LoadAnnotations', reduce_zero_label=True),
+    dict(type='PackSegInputs')
+]
+img_ratios = [0.5, 0.75, 1.0, 1.25, 1.5, 1.75]
+tta_pipeline = [
+    dict(type='LoadImageFromFile', file_client_args=dict(backend='disk')),
+    dict(
+        type='TestTimeAug',
+        transforms=[
+            [
+                dict(type='Resize', scale_factor=r, keep_ratio=True)
+                for r in img_ratios
+            ],
+            [
+                dict(type='RandomFlip', prob=0., direction='horizontal'),
+                dict(type='RandomFlip', prob=1., direction='horizontal')
+            ], [dict(type='LoadAnnotations')], [dict(type='PackSegInputs')]
+        ])
+]
+```
+
+</td>
+</tr>
+</table>
+
 Changes in **`evaluation`**:
 
 - The **`evaluation`** field is split to `val_evaluator` and `test_evaluator`. And it won't support `interval` and `save_best` arguments.
diff --git a/docs/en/user_guides/4_train_test.md b/docs/en/user_guides/4_train_test.md
index 2fee1ac23b..00e074ad39 100644
--- a/docs/en/user_guides/4_train_test.md
+++ b/docs/en/user_guides/4_train_test.md
@@ -62,6 +62,7 @@ This tool accepts several optional arguments, including:
 - `--show-dir`: Directory where painted images will be saved. If specified, the visualized segmentation mask will be saved to the `work_dir/timestamp/show_dir`.
 - `--wait-time`: The interval of show (s), which takes effect when `--show` is activated. Default to 2.
 - `--cfg-options`:  If specified, the key-value pair in xxx=yyy format will be merged into the config file.
+- `--tta`: Test time augmentation option.
 
 **Testing on CPU**: The process of testing on the CPU is consistent with single GPU testing if a machine does not have GPU. If it has GPUs but not wanting to use them, we just need to disable GPUs before the training process.