diff --git a/GB_set_border_mode.md b/GB_set_border_mode.md
index 176b861..cef9028 100644
--- a/GB_set_border_mode.md
+++ b/GB_set_border_mode.md
@@ -8,14 +8,24 @@ typedef enum {
 } GB_border_mode_t;
 ```
 
-<tt>void GB_set_border_mode([[GB_gameboy_t]] *gb, [[GB_border_mode_t]] border_mode);</tt>
+<tt>void GB_set_border_mode([[GB_gameboy_t]] *gb, GB_border_mode_t border_mode);</tt>
 
 In `gb.h`
 
 ## Description
 
-TBD
+This function controls whether an emulator instance should display a border or not:
+
+* `GB_BORDER_SGB`: Only display a border while emulating a Super Game Boy (default)
+* `GB_BORDER_NEVER`: Never display a border
+* `GB_BORDER_ALWAYS`: Always display a border
+
+When using `GB_BORDER_ALWAYS` while emulating a non-Super Game Boy [[model|GB_model_t]], SameBoy use the Super Game Boy border as the border if [[GB_set_boot_rom_load_callback]] was used. Otherwise, or if a Super Game Boy border was not found, a default border for the current model will be used instead.
 
 ## Thread Safety
 
 `GB_set_border_mode` is thread-safe and can be called from any thread and context.
+
+## See Also
+
+* [[GB_get_screen_width and GB_get_screen_height]]
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