1 files changed, 4 insertions, 0 deletions
diff --git a/error.go b/error.go
index 7238203..36f09a2 100644
--- a/error.go
+++ b/error.go
@@ -16,6 +16,10 @@ var (
 	// already open.
 	ErrDatabaseOpen = &Error{"database already open", nil}
 
+	// ErrTransactionNotWritable is returned changing data using a read-only
+	// transaction.
+	ErrTransactionNotWritable = &Error{"transaction not writable", nil}
+
 	// ErrBucketNotFound is returned when trying to access a bucket that has
 	// not been created yet.
 	ErrBucketNotFound = &Error{"bucket not found", nil}