1 files changed, 10 insertions, 0 deletions
diff --git a/error.go b/error.go
index 40877dc..b5302ad 100644
--- a/error.go
+++ b/error.go
@@ -1,5 +1,15 @@
 package bolt
 
+var (
+	InvalidError               = &Error{"Invalid database", nil}
+	VersionMismatchError       = &Error{"version mismatch", nil}
+	DatabaseNotOpenError       = &Error{"db is not open", nil}
+	DatabaseAlreadyOpenedError = &Error{"db already open", nil}
+	TransactionInProgressError = &Error{"writable transaction is already in progress", nil}
+	InvalidTransactionError    = &Error{"txn is invalid", nil}
+	BucketAlreadyExistsError   = &Error{"bucket already exists", nil}
+)
+
 type Error struct {
 	message string
 	cause   error