diff --git a/nrj.c b/nrj.c
index 9babebe..68438d9 100644
--- a/nrj.c
+++ b/nrj.c
@@ -8,14 +8,14 @@
 #include <termios.h>
 #include <unistd.h>
 #include <sys/select.h>
-#ifndef NRJWORD
+#ifndef NRJWORD /* we emulate NRJ16 by default */
 #define NRJWORD unsigned short
 #endif
 #define NRJWSIZE (sizeof(NRJWORD) << 3)
 #define NRJSIZE (1 << NRJWSIZE)
 #define MAXADDR ((NRJWORD) (NRJSIZE - 1))
 
-int kbhit() {
+int kbhit() { /* our best attempt to detect a keypress on a POSIX system */
   struct timeval tv = { 0L, 0L };
   fd_set fds;
   FD_ZERO(&fds);
@@ -66,7 +66,7 @@ int main(int argc, char* argv[]) {
       fseek(prog, 0, SEEK_END);
       int flen = ftell(prog);
       fseek(prog, 0, SEEK_SET);
-      fread(mem, NRJWSIZE, (flen/NRJWSIZE) & MAXADDR, prog);
+      fread(mem, sizeof(NRJWORD), (flen/sizeof(NRJWORD)) & MAXADDR, prog);
       fclose(prog);
       /* prepare the terminal */
       tcgetattr(STDIN_FILENO, &tty_opts_backup);