diff --git a/Docs.md b/Docs.md
index cd669864e9..b5bb508da7 100644
--- a/Docs.md
+++ b/Docs.md
@@ -155,6 +155,9 @@ Other useful commands:
     ./third_party/depot_tools/gn desc out/debug/ :deno
     ./third_party/depot_tools/gn help
 
+    # Update third_party modules
+    git submodule update
+
 Environment variables: `DENO_BUILD_MODE`, `DENO_BUILD_PATH`, `DENO_BUILD_ARGS`,
 `DENO_DIR`.