diff --git a/easyflash/inc/easyflash.h b/easyflash/inc/easyflash.h
index 5a80585..1f3fcdc 100644
--- a/easyflash/inc/easyflash.h
+++ b/easyflash/inc/easyflash.h
@@ -78,6 +78,7 @@ typedef struct _ef_env{
 typedef enum {
     EF_NO_ERR,
     EF_ERASE_ERR,
+    EF_READ_ERR,
     EF_WRITE_ERR,
     EF_ENV_NAME_ERR,
     EF_ENV_NAME_EXIST,