diff --git a/lib/ruby_lsp/requests/completion.rb b/lib/ruby_lsp/requests/completion.rb
index 019e3295d..ffd4c9e53 100644
--- a/lib/ruby_lsp/requests/completion.rb
+++ b/lib/ruby_lsp/requests/completion.rb
@@ -178,6 +178,7 @@ def build_method_completion(entry, node)
           text_edit: Interface::TextEdit.new(range: range_from_node(node), new_text: name),
           kind: Constant::CompletionItemKind::METHOD,
           label_details: Interface::CompletionItemLabelDetails.new(
+            detail: "(#{entry.parameters.map(&:decorated_name).join(", ")})",
             description: entry.file_name,
           ),
           documentation: markdown_from_index_entries(name, entry),
diff --git a/test/requests/completion_test.rb b/test/requests/completion_test.rb
index 8e1badd39..f7df5ef3c 100644
--- a/test/requests/completion_test.rb
+++ b/test/requests/completion_test.rb
@@ -494,6 +494,7 @@ def process
     assert_equal(["bar", "baz"], result.map(&:label))
     assert_equal(["bar", "baz"], result.map(&:filter_text))
     assert_equal(["bar", "baz"], result.map { |completion| completion.text_edit.new_text })
+    assert_equal(["(a, b)", "(c, d)"], result.map { |completion| completion.label_details.detail })
   end
 
   def test_completion_for_methods_named_with_uppercase_characters