diff --git a/API.php b/API.php
index 91f5127..a8c030b 100644
--- a/API.php
+++ b/API.php
@@ -19,7 +19,9 @@
 use Piwik\Piwik;
 
 /**
- * The Custom Variables API lets you access reports for your <a href='http://matomo.org/docs/custom-variables/' rel='noreferrer' target='_blank'>Custom Variables</a> names and values.
+ * The Custom Variables API lets you access reports for your
+ * <a href='http://matomo.org/docs/custom-variables/' rel='noreferrer' target='_blank'>Custom Variables</a>
+ * names and values.
  *
  * @method static \Piwik\Plugins\CustomVariables\API getInstance()
  */
@@ -49,15 +51,22 @@ protected function getDataTable($idSite, $period, $date, $segment, $expanded, $f
     }
 
     /**
-     * @param int $idSite
-     * @param string $period
-     * @param Date $date
-     * @param string|bool $segment
-     * @param bool $expanded
-     * @param bool $_leavePiwikCoreVariables
-     * @param bool $flat
+     * Returns custom variable names for a site.
      *
-     * @return DataTable|DataTable\Map
+     * @param int $idSite The numeric ID of the website to query.
+     * @param string $period The period to process, processes data for the period containing the specified date.
+     *                       Allowed values: "day", "week", "month", "year", "range".
+     * @param string|Date $date The date or date range to process.
+     *                          'YYYY-MM-DD', magic keywords (today, yesterday, lastWeek, lastMonth, lastYear),
+     *                          or date range (ie, 'YYYY-MM-DD,YYYY-MM-DD', lastX, previousX).
+     * @param string|false $segment (Optional) Custom segment to filter the report.
+     *                              Example: "referrerName==twitter.com"
+     *                              Supports AND (;) and OR (,) operators.
+     *                              [See documentation:](https://developer.matomo.org/api-reference/reporting-api-segmentation)
+     * @param bool $expanded Whether to return subtables as nested data.
+     * @param bool $_leavePiwikCoreVariables Whether to keep Matomo reserved custom variable rows.
+     * @param bool $flat Whether to flatten subtables into a single table.
+     * @return DataTable|DataTable\Map Custom variable names report.
      */
     public function getCustomVariables($idSite, $period, $date, $segment = false, $expanded = false, $_leavePiwikCoreVariables = false, $flat = false)
     {
@@ -99,14 +108,21 @@ public static function getReservedCustomVariableKeys()
     }
 
     /**
-     * @param int $idSite
-     * @param string $period
-     * @param Date $date
-     * @param int $idSubtable
-     * @param string|bool $segment
-     * @param bool $_leavePriceViewedColumn
+     * Returns custom variable values for a specific custom variable name row.
      *
-     * @return DataTable|DataTable\Map
+     * @param int $idSite The numeric ID of the website to query.
+     * @param string $period The period to process, processes data for the period containing the specified date.
+     *                       Allowed values: "day", "week", "month", "year", "range".
+     * @param string|Date $date The date or date range to process.
+     *                          'YYYY-MM-DD', magic keywords (today, yesterday, lastWeek, lastMonth, lastYear),
+     *                          or date range (ie, 'YYYY-MM-DD,YYYY-MM-DD', lastX, previousX).
+     * @param int|string|false $idSubtable Subtable ID to load, 'all' to load all subtables, or false for root.
+     * @param string|false $segment (Optional) Custom segment to filter the report.
+     *                              Example: "referrerName==twitter.com"
+     *                              Supports AND (;) and OR (,) operators.
+     *                              [See documentation:](https://developer.matomo.org/api-reference/reporting-api-segmentation)
+     * @param bool $_leavePriceViewedColumn Whether to keep the `price_viewed` column instead of renaming it to `price`.
+     * @return DataTable|DataTable\Map Custom variable values report.
      */
     public function getCustomVariablesValuesFromNameId($idSite, $period, $date, $idSubtable, $segment = false, $_leavePriceViewedColumn = false)
     {
@@ -127,11 +143,14 @@ public function getCustomVariablesValuesFromNameId($idSite, $period, $date, $idS
     }
 
     /**
-     * Get a list of all available custom variable slots (scope + index) and which names have been used so far in
-     * each slot since the beginning of the website.
+     * Returns all custom variable slots and the names used in each slot since the beginning of the website.
      *
-     * @param int $idSite
-     * @return array
+     * @param int $idSite The numeric ID of the website to query.
+     * @return array<int, array{
+     *     scope: string,
+     *     index: int,
+     *     usages: array<int, array{name: mixed, nb_visits: mixed, nb_actions: mixed}>
+     * }> List of custom variable slot usages grouped by scope and index.
      */
     public function getUsagesOfSlots($idSite)
     {
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ed5b32..3454d56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # CHANGELOG
 
+5.0.5 - 2026-02-03
+- Updated API documentation
+
 5.0.4 - 2025-01-20
 - Added missing license file
 
diff --git a/plugin.json b/plugin.json
index c5fc70f..8f5e59a 100644
--- a/plugin.json
+++ b/plugin.json
@@ -1,7 +1,7 @@
 {
     "name": "CustomVariables",
     "description": "Categorise your visitors and actions with custom name-value pairs. Segment by these values and get more insights to draw the right conclusions.",
-    "version": "5.0.4",
+    "version": "5.0.5",
     "keywords": ["custom variables"],
     "license": "GPL v3+",
     "homepage": "https://matomo.org",