diff --git a/20230220084107_word_form_example_texts_pos.down.sql b/20230220084107_word_form_example_texts_pos.down.sql
new file mode 100644
index 0000000..ff5e140
--- /dev/null
+++ b/20230220084107_word_form_example_texts_pos.down.sql
@@ -0,0 +1 @@
+ALTER TABLE word_form_example_texts DROP COLUMN pos;
diff --git a/20230220084107_word_form_example_texts_pos.up.sql b/20230220084107_word_form_example_texts_pos.up.sql
new file mode 100644
index 0000000..26dbc8f
--- /dev/null
+++ b/20230220084107_word_form_example_texts_pos.up.sql
@@ -0,0 +1 @@
+ALTER TABLE word_form_example_texts ADD COLUMN pos INTEGER;
diff --git a/20230220084415_word_form_example_texts_validate.down.sql b/20230220084415_word_form_example_texts_validate.down.sql
new file mode 100644
index 0000000..cb4d78e
--- /dev/null
+++ b/20230220084415_word_form_example_texts_validate.down.sql
@@ -0,0 +1,5 @@
+BEGIN;
+ALTER TABLE word_form_example_texts ALTER COLUMN pos DROP NOT NULL;
+ALTER TABLE word_form_example_texts DROP CONSTRAINT pos_is_not_negative;
+DROP INDEX word_form_example_texts_pos;
+COMMIT;
diff --git a/20230220084415_word_form_example_texts_validate.up.sql b/20230220084415_word_form_example_texts_validate.up.sql
new file mode 100644
index 0000000..c769be4
--- /dev/null
+++ b/20230220084415_word_form_example_texts_validate.up.sql
@@ -0,0 +1,7 @@
+BEGIN;
+ALTER TABLE word_form_example_texts ALTER COLUMN pos SET NOT NULL;
+ALTER TABLE word_form_example_texts ADD CONSTRAINT pos_is_not_negative
+    CHECK (pos >= 0);
+CREATE UNIQUE INDEX word_form_example_texts_pos
+    ON word_form_example_texts (example_text_id, pos);
+COMMIT;