diff --git a/docs/issues/issues.md b/docs/issues/issues.md
index 8936996..0d7cba3 100644
--- a/docs/issues/issues.md
+++ b/docs/issues/issues.md
@@ -26,6 +26,9 @@ $issue = $youtrack
 ```
 Returns the data of the newly created issue. The return fields can also be defined here via `->fields()`.
 
+##### `update($issueId, $parameter)`
+Updates an issue base on the Issue id.
+
 ##### `customFields($issueId)`
 Returns all custom fields based on the issue ID.
 
diff --git a/src/Api/Issue.php b/src/Api/Issue.php
index 60ca1e2..ef607b7 100644
--- a/src/Api/Issue.php
+++ b/src/Api/Issue.php
@@ -125,9 +125,9 @@ public function create(array $parameter): array
     /**
      * Update an existing issue.
      */
-    public function update(): array
+    public function update(string $issueId, array $parameter): array
     {
-        // ToDo: https://www.jetbrains.com/help/youtrack/devportal/api-usecase-update-text-field-value.html
+        return $this->post("issues/$issueId", $parameter);
     }
 
     /**