diff --git a/hw/xbox/nv2a.c b/hw/xbox/nv2a.c
index 0a37d3a2d4..faa4a9dea8 100644
--- a/hw/xbox/nv2a.c
+++ b/hw/xbox/nv2a.c
@@ -3718,7 +3718,9 @@ static void pgraph_init(NV2AState *d)
 
     glextensions_init();
 
+    /* DXT textures */
     assert(glo_check_extension("GL_EXT_texture_compression_s3tc"));
+    /*  Internal RGB565 texture format */
     assert(glo_check_extension("GL_ARB_ES2_compatibility"));
 
     GLint max_vertex_attributes;