diff --git a/clang-tools-extra/clangd/ConfigYAML.cpp b/clang-tools-extra/clangd/ConfigYAML.cpp
--- a/clang-tools-extra/clangd/ConfigYAML.cpp
+++ b/clang-tools-extra/clangd/ConfigYAML.cpp
@@ -38,6 +38,7 @@
     DictParser Dict("Config", this);
     Dict.handle("If", [&](Node &N) { parse(F.If, N); });
     Dict.handle("CompileFlags", [&](Node &N) { parse(F.CompileFlags, N); });
+    Dict.handle("Index", [&](Node &N) { parse(F.Index, N); });
     Dict.parse(N);
     return !(N.failed() || HadError);
   }
diff --git a/clang-tools-extra/clangd/unittests/ConfigYAMLTests.cpp b/clang-tools-extra/clangd/unittests/ConfigYAMLTests.cpp
--- a/clang-tools-extra/clangd/unittests/ConfigYAMLTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ConfigYAMLTests.cpp
@@ -119,6 +119,16 @@
   ASSERT_THAT(Results, IsEmpty());
 }
 
+TEST(ParseYAML, Index) {
+  CapturedDiags Diags;
+  const char *YAML = R"yaml(
+Index:
+  Background: Skip
+  )yaml";
+  auto Results = Fragment::parseYAML(YAML, "config.yaml", Diags.callback());
+  EXPECT_THAT(Diags.Diagnostics, IsEmpty());
+}
+
 } // namespace
 } // namespace config
 } // namespace clangd