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+# Known limitations
+This file documents the known limitations of the SQLite driver that are difficult
+to address and are not currently planned to be resolved.
+
+### Number of affected rows when values are not changed
+In some cases, the number of affected rows reported by the SQLite driver may
+differ from the number returned by MySQL. This is because SQLite always reports
+the number of rows matched by a statement, regardless of whether they were
+actually changed or set to the same values as they already held.
+
+Example:
+
+```sql
+CREATE TABLE t (id INT);
+INSERT INTO t (id) VALUES (1);
+UPDATE t SET id = 1;
+```
+
+The `UPDATE` statement above reports `0` affected rows in MySQL, but `1` in SQLite.
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