diff --git a/GIT_SUBMODULE.md b/GIT_SUBMODULE.md
index f3a9e57..8f64f5d 100644
--- a/GIT_SUBMODULE.md
+++ b/GIT_SUBMODULE.md
@@ -3,23 +3,50 @@ git submodule add https://git2.tavasi.ir/front/chat_ui.git systems/chat_ui -f
 
 Cloning a Repository with Submodules
 If you clone a repository that contains submodules, you'll need to initialize and update the submodules:
-    git clone <repository-url>
-    cd <repository-directory>
-    git submodule init
-    git submodule update
+git clone <repository-url>
+cd <repository-directory>
+git submodule init
+git submodule update
 
 Or, you can do it in one step:
-    git clone --recurse-submodules <repository-url>
+git clone --recurse-submodules <repository-url>
 
 Updating Submodules
 To update a submodule to the latest commit on its branch:
-    git submodule update --remote
+git submodule update --remote
 
-Removing a Submodule
-Removing a submodule is a bit more involved:
+## How to Remove an Existing Submodule
 
-    Remove the submodule entry from .gitmodules.
-    Stage the .gitmodules changes: git add .gitmodules.
-    Remove the submodule from the working tree and index: git rm --cached <path-to-submodule>.
-    Delete the submodule directory: rm -rf <path-to-submodule>.
-    Commit the changes: git commit -m "Removed submodule <submodule-name>".
+If the path was previously added as a submodule, you need to remove it completely before re-adding it. Follow these steps:
+
+1.  Remove the submodule entry from .gitmodules.
+2.  Remove the submodule from the working tree and index: git rm --cached <path-to-submodule>.
+3.  Delete the submodule directory: rm -rf <path-to-submodule>.
+4.  Stage the .gitmodules changes: git add .gitmodules.
+5.  Commit the changes: git commit -m "Removed submodule <submodule-name>".
+
+errors:
+
+# repo already exists and is not a valid git repo
+
+Check if the path is already tracked
+git ls-files --stage systems/chat_ui (100644 <hash> 0 <path>)
+
+If it is, remove it from the index
+git rm --cached systems/chat_ui
+
+If system/chat_ui exits, remote it(chat_ui)
+rm -rf systems/chat_ui
+
+Add the submodule
+git submodule add https://github.com/example/repo.git systems/chat_ui
+
+Commit the changes
+git commit -m "Added submodule at systems/chat_ui"
+
+Verify the submodule
+git submodule status
+
+(Optional) Initialize and Update the Submodule
+If the submodule was added successfully but not initialized, run:
+git submodule update --init --recursive