diff --git a/Automatic-output-splitting.md b/Automatic-output-splitting.md
index e3bb720..2db7fb0 100644
--- a/Automatic-output-splitting.md
+++ b/Automatic-output-splitting.md
@@ -4,6 +4,6 @@ Fortunately **KCC** will automatically split tasks into multiple _MOBI_ files **
 For now **KCC** support three directory structures. If none of these structures will be used creating MOBI file might fail.
 **Naming conventions listed below are NOT necessary. Only structure matter.**
 
-If variant with volume directories will be used **KCC** will create separate MOBI for each one.
+If input directory have more than 250mb and variant with volume directories will be used **KCC** will create separate MOBI for each one.
 
 ![FS](http://kcc.vulturis.eu/img/FS.png)