diff --git a/FAQ-Keymap.md b/FAQ-Keymap.md
index a607cfb33..20b9cefc6 100644
--- a/FAQ-Keymap.md
+++ b/FAQ-Keymap.md
@@ -111,4 +111,13 @@ https://github.com/tekezo/Karabiner/issues/403
 
 
 ## Esc and `~ on a key
-https://github.com/p3lim/keyboard_firmware/commit/fd799c12b69a5ab5addd1d4c03380a1b8ef8e9dc
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+https://github.com/p3lim/keyboard_firmware/commit/fd799c12b69a5ab5addd1d4c03380a1b8ef8e9dc
+
+
+## 32 Fn keys are not enough?
+### actionmap
+It uses 16 bit codes and no limitation of 32 Fn at the expense of memory space. TMK keymap is actually is 8 bit codes as subset of the actionmap.
+https://github.com/tmk/tmk_keyboard/issues?utf8=%E2%9C%93&q=is%3Aissue+actionmap
+
+### extension for modified keys
+https://geekhack.org/index.php?topic=41989.msg1885526#msg1885526
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