diff --git a/activesupport/lib/active_support/encrypted_file.rb b/activesupport/lib/active_support/encrypted_file.rb
index 6a6d6c0c33d4d..2273159621881 100644
--- a/activesupport/lib/active_support/encrypted_file.rb
+++ b/activesupport/lib/active_support/encrypted_file.rb
@@ -49,6 +49,14 @@ def key
       read_env_key || read_key_file || handle_missing_key
     end
 
+    # Reads the file and returns the decrypted content.
+    #
+    # Raises:
+    # - MissingKeyError if the key is missing and +raise_if_missing_key+ is true.
+    # - MissingContentError if the encrypted file does not exist or otherwise
+    #   if the key is missing.
+    # - ActiveSupport::MessageEncryptor::InvalidMessage if the content cannot be
+    #   decrypted or verified.
     def read
       if !key.nil? && content_path.exist?
         decrypt content_path.binread