diff --git a/app/Services/AuditTrail/ActivityLogger.php b/app/Services/AuditTrail/ActivityLogger.php
index 5e3861a..60c5268 100644
--- a/app/Services/AuditTrail/ActivityLogger.php
+++ b/app/Services/AuditTrail/ActivityLogger.php
@@ -27,14 +27,14 @@ public function __construct()
         $this->category = Category::GENERAL;
     }
 
-    public function performedOn(Study $study): static
+    public function on(Study $study): static
     {
         $this->studyId = $study->id;
 
         return $this;
     }
 
-    public function causedBy(Authenticatable|int $user): static
+    public function by(Authenticatable|int $user): static
     {
         if ($user == null) {
             return $this;
@@ -77,9 +77,9 @@ public function notes(string $notes): static
         return $this;
     }
 
-    public function withAgent(): static
+    public function ua(?string $agent = null): static
     {
-        $this->userAgent = request()->userAgent();
+        $this->userAgent = $agent ?? request()->userAgent();
 
         return $this;
     }
diff --git a/app/Services/AuditTrail/Category.php b/app/Services/AuditTrail/Category.php
index 9e50c4a..7bbaad1 100644
--- a/app/Services/AuditTrail/Category.php
+++ b/app/Services/AuditTrail/Category.php
@@ -4,5 +4,11 @@
 
 final class Category
 {
-    public const int GENERAL = 1;
+    public const int GENERAL = 10;
+
+    public const int SYSTEM = 20;
+
+    public const int PACS = 30;
+
+    public const int AUTH = 40;
 }