diff --git a/GB_key_t.md b/GB_key_t.md
index 5e9c0bf..0a91210 100644
--- a/GB_key_t.md
+++ b/GB_key_t.md
@@ -18,4 +18,9 @@ In `joypad.h`
 
 ## Description
 
-TBD
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+An enum representing each of the 8 buttons of a Game Boy, for use with functions such as [[GB_set_key_state]].
+
+## See Also
+
+* [[GB_set_key_state]]
+* [[GB_set_key_state_for_player]]
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