diff --git a/docs/reference.md b/docs/reference.md
index e48e43d..f8c43a3 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -8392,6 +8392,7 @@
     *   --nocolor: Force non-colored output.
     *   -q: Quiet mode. Don't print output on success.
     *   --root: Explicitly specify source root.
+    *   --root-pattern: Add root pattern override.
     *   --root-target: Override the root target.
     *   --runtime-deps-list-file: Save runtime dependencies for targets in file.
     *   --script-executable: Set the executable used to execute scripts.
diff --git a/src/gn/switches.cc b/src/gn/switches.cc
index 67c18a1..bf0c753 100644
--- a/src/gn/switches.cc
+++ b/src/gn/switches.cc
@@ -338,6 +338,7 @@
     INSERT_VARIABLE(NinjaExecutable)
     INSERT_VARIABLE(NoColor)
     INSERT_VARIABLE(Root)
+    INSERT_VARIABLE(RootPattern)
     INSERT_VARIABLE(RootTarget)
     INSERT_VARIABLE(Quiet)
     INSERT_VARIABLE(RuntimeDepsListFile)