diff --git a/stdlib/uri/0/generic.rbs b/stdlib/uri/0/generic.rbs
index c32d7f1a0..8e35c3af0 100644
--- a/stdlib/uri/0/generic.rbs
+++ b/stdlib/uri/0/generic.rbs
@@ -910,6 +910,13 @@ module URI
     #
     def merge: (URI::Generic | string oth) -> URI::Generic
 
+    # <!--
+    #   rdoc-file=lib/uri/generic.rb
+    #   - +(oth)
+    # -->
+    #
+    alias + merge
+
     # :stopdoc:
     def route_from_path: (String src, String dst) -> String