diff --git a/dvc/output/base.py b/dvc/output/base.py
index 8727bb328a..fef7e592cd 100644
--- a/dvc/output/base.py
+++ b/dvc/output/base.py
@@ -31,7 +31,11 @@ def __init__(self, path):
 
 class OutputAlreadyTrackedError(DvcException):
     def __init__(self, path):
-        msg = f"output '{path}' is already tracked by SCM (e.g. Git)"
+        msg = f""" output '{path}' is already tracked by SCM (e.g. Git).
+    You can remove it from git, then add to DVC.
+        To stop tracking from git:
+            git rm -r --cached '{path}'
+            git commit -m "stop tracking {path}" """
         super().__init__(msg)
 
 
diff --git a/tests/func/test_add.py b/tests/func/test_add.py
index 11879f4109..85e652db11 100644
--- a/tests/func/test_add.py
+++ b/tests/func/test_add.py
@@ -124,10 +124,16 @@ def test(self):
 
 
 def test_add_tracked_file(tmp_dir, scm, dvc):
-    tmp_dir.scm_gen("tracked_file", "...", commit="add tracked file")
-
-    with pytest.raises(OutputAlreadyTrackedError):
-        dvc.add("tracked_file")
+    path = "tracked_file"
+    tmp_dir.scm_gen(path, "...", commit="add tracked file")
+    msg = f""" output '{path}' is already tracked by SCM \\(e.g. Git\\).
+    You can remove it from git, then add to DVC.
+        To stop tracking from git:
+            git rm -r --cached '{path}'
+            git commit -m "stop tracking {path}" """
+
+    with pytest.raises(OutputAlreadyTrackedError, match=msg):
+        dvc.add(path)
 
 
 class TestAddDirWithExistingCache(TestDvc):