diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5e12df..050bf8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 - **[PR #82](https://github.com/shortdudey123/chef-gluster/pull/82)** - Add license and fix readme
 - **[PR #84](https://github.com/shortdudey123/chef-gluster/pull/84)** - Allow disable of server extending support
+- **[PR #90](https://github.com/shortdudey123/chef-gluster/pull/90)** - Add parameters for volume_option to README
 
 ## v5.2.0 (2016-12-09)
 - **[PR #77](https://github.com/shortdudey123/chef-gluster/pull/77)** - Allow use gluster recipe on already existed filesystem
diff --git a/README.md b/README.md
index 15997e9..f529492 100644
--- a/README.md
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@@ -116,7 +116,9 @@ end
 
 #### Parameters
 
+- `key` - Volume option to change. Required. Derived from after the `/` of resource name if not given.
 - `value` - The value to set for the given option. Required for the set action. Booleans are mapped to `on` or `off`.
+- `volume` - Volume to chnage. Required. Derived from before the `/` of resource name if not given.
 
 ## Usage