diff --git a/docs/en/notes/faq.md b/docs/en/notes/faq.md
index bb09873cf..cd6885216 100644
--- a/docs/en/notes/faq.md
+++ b/docs/en/notes/faq.md
@@ -17,7 +17,11 @@ The compatible MMSegmentation, MMCV and MMEngine versions are as below. Please i
 |        1.0.0rc1        | mmcv >= 2.0.0rc1, \<=2.0.0rc3> | MMEngine >= 0.1.0 |           mmcls>=1.0.0rc0           |          Not required          |
 |        1.0.0rc0        | mmcv >= 2.0.0rc1, \<=2.0.0rc3> | MMEngine >= 0.1.0 |           mmcls>=1.0.0rc0           |          Not required          |
 
-Notes: To install MMSegmentation 0.x and master branch, please refer to [the faq 0.x document](https://mmsegmentation.readthedocs.io/en/latest/faq.html#installation) to check compatible versions of MMCV.
+Notes:
+
+- MMClassification and MMDetatction are optional for MMSegmentation. If you didn't install them, `ConvNeXt` (required MMClassification) and MaskFormer, Mask2Former (required MMDetection) cannot be used. We recommend to install them with source code. Please refer to [MMClasssication](https://github.com/open-mmlab/mmclassification) and [MMDetection](https://github.com/open-mmlab/mmdetection) for more details about their installation.
+
+- To install MMSegmentation 0.x and master branch, please refer to [the faq 0.x document](https://mmsegmentation.readthedocs.io/en/latest/faq.html#installation) to check compatible versions of MMCV.
 
 ## How to know the number of GPUs needed to train the model
 
diff --git a/requirements/mminstall.txt b/requirements/mminstall.txt
index 707ba66ff..df073e0c1 100644
--- a/requirements/mminstall.txt
+++ b/requirements/mminstall.txt
@@ -1,4 +1,2 @@
-mmcls>=1.0.0rc0
 mmcv>=2.0.0rc4
--e git+https://github.com/open-mmlab/mmdetection.git@dev-3.x#egg=mmdet
 mmengine>=0.5.0,<1.0.0