diff --git a/README.md b/README.md
index 901ff1f..7bbf3da 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ The floppy disk is FAT12 formatted. It must contain at least the following items
 * return value in AX
 
 | AH | AL | stack arguments | return | description |
-|-------------|--------------|-----------------|-------------|
+| --- | --- | --- | --- | --- |
 | _0x01_ | | _addr_, _c_, _h_, _s_ | error code in AH | __readsector__: reads 1 floppy sector at _c/h/s_ into _0000:addr_ |
 | _0x02_ | | _addr_, _c_, _h_, _s_ | error code in AH | __writesector__: writes 1 floppy sector at _c/h/s_ from _0000:addr_ |
 | 0x03 | | _c_, _h_ | error code in AH | __formattrack__: formats 1 track at c/h |