diff --git a/Makefile b/Makefile
index c189921..2eda6d1 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ help:
 	@echo  "usage: make <target>"
 	@echo  "Targets:"
 	@echo  "    up			Updates dev/test dependencies"
-	@echo  "    deps        Ensure dev/test dependencies are installed"
+	@echo  "    deps		Ensure dev/test dependencies are installed"
 	@echo  "    check		Checks that build is sane"
 	@echo  "    lint		Reports all linter violations"
 	@echo  "    test		Runs all tests"
diff --git a/README.rst b/README.rst
index 9093327..089b594 100644
--- a/README.rst
+++ b/README.rst
@@ -159,6 +159,11 @@ Show heads to be migrated
 
     1_202029051520102929_drop_column.json
 
+Limitations
+-----------
+* Not support ``change column`` now.
+* ``Sqlite`` and ``Postgres`` may not work as expected because I don't use those in my work.
+
 License
 =======
 This project is licensed under the `MIT <https://github.com/long2ice/aerich/blob/master/LICENSE>`_ License.