diff --git a/clang/docs/tools/dump_ast_matchers.py b/clang/docs/tools/dump_ast_matchers.py
index 5db6826070934..f263fc271b6cb 100755
--- a/clang/docs/tools/dump_ast_matchers.py
+++ b/clang/docs/tools/dump_ast_matchers.py
@@ -6,6 +6,7 @@
 import collections
 import re
 import os
+import sys
 from urllib.request import urlopen
 
 
@@ -612,5 +613,7 @@ def sort_table(matcher_type, matcher_map):
     flags=re.S,
 )
 
-with open(HTML_FILE, "w", newline="\n") as output:
+output_file = sys.argv[1] if len(sys.argv) == 2 else HTML_FILE
+
+with open(output_file, "w", newline="\n") as output:
     output.write(reference)
diff --git a/clang/test/AST/ast_matchers_updated.test b/clang/test/AST/ast_matchers_updated.test
new file mode 100644
index 0000000000000..0eba16a1a5c00
--- /dev/null
+++ b/clang/test/AST/ast_matchers_updated.test
@@ -0,0 +1,4 @@
+// FIXME enable windows
+// UNSUPPORTED: system-windows
+// RUN: %python %S/../../docs/tools/dump_ast_matchers.py %t
+// RUN: diff %t %S/../../docs/LibASTMatchersReference.html