diff --git a/docs/cops_solidus.md b/docs/cops_solidus.md
index ffa9c73..f8786d9 100644
--- a/docs/cops_solidus.md
+++ b/docs/cops_solidus.md
@@ -305,3 +305,25 @@ I18n.t('bar', scope: 'spree.admin.city')
 ### References
 
 * [https://github.com/solidusio/rubocop-solidus/issues/22](https://github.com/solidusio/rubocop-solidus/issues/22)
+
+## Solidus/TaxCategoryDeprecated
+
+Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChanged | Required Solidus Version
+--- | --- | --- | --- | --- | ---
+Enabled | Yes | No | <<next>> | - | 2.2
+
+This cop finds .tax_category occurrences and suggest using .tax_categories instead.
+
+### Examples
+
+```ruby
+# bad
+  model.tax_category = data
+
+# good
+  model.tax_categories = [data]
+```
+
+### References
+
+* [https://github.com/solidusio/rubocop-solidus/issues/25](https://github.com/solidusio/rubocop-solidus/issues/25)
diff --git a/docs/index.md b/docs/index.md
index 58438c3..35e49db 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -14,5 +14,6 @@ In the following sections, you will find all available cops:
 * [Solidus/SpreeIconDeprecated](cops_solidus.md#solidusspreeicondeprecated)
 * [Solidus/SpreeRefundCallPerform](cops_solidus.md#solidusspreerefundcallperform)
 * [Solidus/SpreeTDeprecated](cops_solidus.md#solidusspreetdeprecated)
+* [Solidus/TaxCategoryDeprecated](cops_solidus.md#solidustaxcategorydeprecated)
 
 <!-- END_COP_LIST -->
\ No newline at end of file