diff --git a/README.md b/README.md
index d819a88..9982b57 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,9 @@ This extends the default JSON serialization adding the following:
 - Function serialization (off by default)
 - Deep and partial-deep cleen object copy
 
+Possible differences to JSON output:
+- Repeating long strings and BigInts can be referenced instead of 
+  reincluded in the output.
 
 
 ## Motivation
@@ -45,8 +48,21 @@ loosing:
 Thus, care must be taken when serializing structures containing function.
 
 
+
 ## API
 
+### `STRING_LENGTH_REF` / `settings.string_length_ref` 
+
+Defines the default maximum string to include in the output as-is before 
+referencing.
+
+If set to `0`, referencing will be disabled.
+
+Default: 96  
+(Dynamic: `.REFERENCE.length * 16`) 
+
+
+
 ### `serialize(..)` / `eJSON.stringify(..)`
 
 ### `deserialize(..)` / 'eJSON.parse(..)'
diff --git a/serialize.js b/serialize.js
index 192b967..0b27c36 100644
--- a/serialize.js
+++ b/serialize.js
@@ -77,7 +77,7 @@ var debug = {
 
 //---------------------------------------------------------------------
 
-module.STRING_LENGTH_REF = REFERENCE.length * 8
+module.STRING_LENGTH_REF = REFERENCE.length * 16
 
 
 //