diff --git a/docs/usage.md b/docs/usage.md
index f072ba565b84454879b8f1e9f83cf368f74ae24f..4423d1954c8f014a75525d112d1190454729801d 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -485,7 +485,7 @@ framework to build the raw and balanced contact maps in txt and (m)cool formats.
 ### `--bin_size`
 
 Resolution of contact maps to generate (comma separated).
-Default:'1000000'
+Default:'1000000,500000'
 
 ```bash
 --bins_size '[string]'