diff --git a/.spi.yml b/.spi.yml
index d8e7812f00a..5b8d735168a 100644
--- a/.spi.yml
+++ b/.spi.yml
@@ -21,3 +21,4 @@ builder:
       - SwiftSyntaxMacros
       - SwiftSyntaxMacroExpansion
       - SwiftSyntaxMacrosTestSupport
+      custom_documentation_parameters: [--experimental-skip-synthesized-symbols]