diff --git a/docs/usage.md b/docs/usage.md
index dd04691..b6885bb 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -120,7 +120,7 @@ curl http://0.0.0.0:80/api/v1/attack/494f98a2-7165-4d1b-8834-3226b49ab582
 Availables parameters :
 * status : `scheduled | running | canceled | completed | failed`
 * created_before : `YYYY-mm-dd+hh:ii:ss` (date must be url-encoded)
-* created_after : `YYYY-mm-dd hh:ii:ss` (date must be url-encoded)
+* created_after : `YYYY-mm-dd+hh:ii:ss` (date must be url-encoded)
 
 ```
 curl http://0.0.0.0:80/api/v1/attack/