diff --git a/engine.go b/engine.go
index 645891b6..fb19176e 100644
--- a/engine.go
+++ b/engine.go
@@ -1241,6 +1241,7 @@ func (engine *Engine) Delete(beans ...interface{}) (int64, error) {
 }
 
 // Truncate records, bean's non-empty fields are conditions
+// In contrast to Delete this method allows deletes without conditions.
 func (engine *Engine) Truncate(beans ...interface{}) (int64, error) {
 	session := engine.NewSession()
 	defer session.Close()
diff --git a/session_delete.go b/session_delete.go
index 1031d08e..d36b9e52 100644
--- a/session_delete.go
+++ b/session_delete.go
@@ -97,6 +97,7 @@ func (session *Session) Delete(beans ...interface{}) (int64, error) {
 }
 
 // Truncate records, bean's non-empty fields are conditions
+// In contrast to Delete this method allows deletes without conditions.
 func (session *Session) Truncate(beans ...interface{}) (int64, error) {
 	return session.delete(beans, false)
 }