From c0fc92ab18eec1387851aabb2b1993e0cb7a4456 Mon Sep 17 00:00:00 2001
From: Ruslan Iushchenko <yruslan@gmail.com>
Date: Fri, 21 Feb 2025 07:43:00 +0100
Subject: [PATCH] #744 Update README of the new feature.

---
 README.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README.md b/README.md
index 87a1de24..754d68ce 100644
--- a/README.md
+++ b/README.md
@@ -485,6 +485,13 @@ If the record field contains a string that can be mapped to a record size, you c
 .option("record_length_map", """{"SEG1":100,"SEG2":200}""")  
 ```
 
+You can specify the default record size by defining the key "_":
+```
+.option("record_format", "F")
+.option("record_length_field", "FIELD_STR")
+.option("record_length_map", """{"SEG1":100,"SEG2":200,"_":100}""")  
+```
+
 ### Use cases for various variable length formats
 
 In order to understand the file format it is often sufficient to look at the first 4 bytes of the file (un case of RDW only files),