docs: tweak keep_data_small.txt
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/docs/keep_data_small.txt b/docs/keep_data_small.txt
index 9fc7996..3ced1a6 100644
--- a/docs/keep_data_small.txt
+++ b/docs/keep_data_small.txt
@@ -103,7 +103,15 @@
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G)));
-Typically it is done in <applet>_main().
+Typically it is done in <applet>_main(). Another variation is
+to use stack:
+
+int <applet>_main(...)
+{
+#undef G
+ struct globals G;
+ memset(&G, 0, sizeof(G));
+ SET_PTR_TO_GLOBALS(&G);
Now you can reference "globals" by G.a, G.buf and so on, in any function.