diff --git a/src/fontgen/fontgen.c b/src/fontgen/fontgen.c
index 152d6aa..9447612 100644
--- a/src/fontgen/fontgen.c
+++ b/src/fontgen/fontgen.c
@@ -110,6 +110,7 @@ static void generate(const char * d_file_name)
     fprintf(fh, "    [\n");
     for (int i = 0; i < N_CHARS; i++)
     {
+        fprintf(fh, "        /* %d */", i);
         fprintf(fh, "        CharInfo(\n");
         fprintf(fh, "            %du,\n", char_infos[i].width);
         fprintf(fh, "            %du,\n", char_infos[i].height);