diff --git a/libretro/libretro.cpp b/libretro/libretro.cpp
index 9c5bb99f..c1873ed0 100644
--- a/libretro/libretro.cpp
+++ b/libretro/libretro.cpp
@@ -61,7 +61,7 @@ void retro_set_environment(retro_environment_t cb)
    
    struct retro_variable variables[] = {
       // These variable names and possible values constitute an ABI with ZMZ (ZSNES Libretro player).
-      // Changing "Show layer 1" is fine, but don't change "layer_1"/etc or the Yes|No ones.
+      // Changing "Show layer 1" is fine, but don't change "layer_1"/etc or the possible values ("Yes|No").
       // Adding more variables and rearranging them is safe.
       { "s9x_layer_1", "Show layer 1; Yes|No" },
       { "s9x_layer_2", "Show layer 2; Yes|No" },