diff --git a/stmt.go b/stmt.go
index 9c20b30..34fdafb 100644
--- a/stmt.go
+++ b/stmt.go
@@ -553,6 +553,14 @@ func (s *Stmt) ColumnValue(col int) Value {
 	}
 }
 
+// Columns populates result columns into the provided slice.
+// The slice must have [Stmt.ColumnCount] length.
+//
+// [INTEGER] columns will be retrieved as int64 values,
+// [FLOAT] as float64, [NULL] as nil,
+// [TEXT] as string, and [BLOB] as []byte.
+// Any []byte are owned by SQLite and may be invalidated by
+// subsequent calls to [Stmt] methods.
 func (s *Stmt) Columns(dest []any) error {
 	defer s.c.arena.mark()()
 	count := uint64(len(dest))
diff --git a/util/fsutil/mode.go b/util/fsutil/mode.go
index c38fef5..88b1572 100644
--- a/util/fsutil/mode.go
+++ b/util/fsutil/mode.go
@@ -1,3 +1,4 @@
+// Package fsutil implements filesystem utility functions.
 package fsutil
 
 import (