diff --git a/rbi/annotations/activesupport.rbi b/rbi/annotations/activesupport.rbi
index a422b3c7..91ad62d0 100644
--- a/rbi/annotations/activesupport.rbi
+++ b/rbi/annotations/activesupport.rbi
@@ -259,3 +259,23 @@ class Time
   sig { returns(TrueClass) }
   def present?; end
 end
+
+class Symbol
+  # @shim: alias for `#start_with?`
+  sig { params(string_or_regexp).returns(T::Boolean) }
+  def starts_with?(*string_or_regexp)
+
+  # @shim: alias for `#end_with?`
+  sig { params(string_or_regexp).returns(T::Boolean) }
+  def ends_with?(*string_or_regexp); end
+end
+
+class String
+  # @shim: alias for `#start_with?`
+  sig { params(string_or_regexp).returns(T::Boolean) }
+  def starts_with?(*string_or_regexp)
+
+  # @shim: alias for `#end_with?`
+  sig { params(string_or_regexp).returns(T::Boolean) }
+  def ends_with?(*string_or_regexp); end
+end