From 01e8b35e7fc11874b69e8f90149ced25a46f3584 Mon Sep 17 00:00:00 2001
From: DenChenn <aaaa102234@gmail.com>
Date: Wed, 6 Sep 2023 16:59:36 +0800
Subject: [PATCH] doc: type assertion

---
 README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.md b/README.md
index 9441802..6095c64 100644
--- a/README.md
+++ b/README.md
@@ -80,3 +80,13 @@ if errors.Is(err, &pgx.ErrNoRows) {
   return &alayer.Err1.Wrap(err) 
 }
 ```
+
+## Type assertion
+All generated errors implement `blunder.OrdinaryError` interface, which contains static methods.
+
+```go
+ordinaryError, ok := err.(blunder.OrdinaryError)
+if ok {
+	fmt.Println(ordinaryError.GetId())
+}
+```