diff --git a/Signal/src/ViewControllers/SignalAttachment.swift b/Signal/src/ViewControllers/SignalAttachment.swift
index 19e0b6c21..d56593292 100644
--- a/Signal/src/ViewControllers/SignalAttachment.swift
+++ b/Signal/src/ViewControllers/SignalAttachment.swift
@@ -338,6 +338,7 @@ class SignalAttachment: NSObject {
             }
         }
         if pasteboardUTISet.contains(kUTTypeURL as String) {
+            // Treat URL as a textual UTI type.
             hasTextUTIType = true
         }
         if hasNonTextUTIType {