diff --git a/GB_set_key_mask.md b/GB_set_key_mask.md
index d003ede..148abf7 100644
--- a/GB_set_key_mask.md
+++ b/GB_set_key_mask.md
@@ -6,8 +6,15 @@ In `joypad.h`
 
 ## Description
 
-TBD
+Sets the state for all of player 1's buttons using a [[mask|GB_key_mask_t]].
 
 ## Thread Safety
 
 `GB_set_key_mask` is thread-safe and can be called from any thread and context.
+
+## See Also
+
+* [[GB_key_mask_t]]
+* [[GB_set_key_state]]
+* [[GB_set_key_mask_for_player]]
+* [[GB_get_player_count]]
\ No newline at end of file