diff --git a/gen.h b/gen.h
index 8629ac9..291e32b 100644
--- a/gen.h
+++ b/gen.h
@@ -28,5 +28,6 @@ typedef enum { rm_prev, rm_cur } rm_selection_t;
 // see also https://github.com/espressif/esp-idf/issues/1934
 #define DEFAULT_N_PAGES 12
 #else
+// more requires unibusmap support
 #define DEFAULT_N_PAGES 31
 #endif