diff --git a/README.md b/README.md
index fd6b8a2..9793ffd 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,10 @@ If you want to update the SMC firmware, please read this [guide](doc/update-guid
 | 0x41      | Master read       | 1 byte            | Get Keycode Fast              |
 | 0x42      | Master read       | 1 byte            | Get Mouse Movement Fast       |
 | 0x43      | Master read       | 1 byte            | Get PS/2 Data Fast            |
+| 0x44      | Master read       | 1 byte            | Get low fuse setting          |
+| 0x45      | Master read       | 1 byte            | Get lock bits                 |
+| 0x46      | Master read       | 1 byte            | Get extended fuse setting     |
+| 0x47      | Master read       | 1 byte            | Get high fuse setting         |
 | 0x8e      | Master write      | 1 byte            | Get Bootloader Version        |
 | 0x8f      | Master write      | 0x31              | Start bootloader              |
 | 0x90      | Master write      | 1 byte            | Set flash page (0-127)        |
@@ -165,6 +169,18 @@ the firmware was especially designed with these commands in mind:
 - Get Mouse Movement Fast (0x42) returns a mouse packet if available, otherwise the request is NACKed.
 - Get PS/2 Data Fast (0x43) returns both keycode and mouse packet, first a key code (1 byte) and then a mouse packet (3..4 bytes). If only one of them is available, the other will be reported as 0. If neither one is available, the request is NACKed.
 
+## Get fuses and lock bits (0x44..0x47)
+
+These offsets returns the fuse settings and lock bits (low-lock-extended-high).
+
+Expected value:
+- Low: $F1
+- Lock: $FF
+- Extended: $FE
+- High: $D4
+
+The reason for this particular order, is size optimization in SMC FW.
+
 ## Get bootloader version (0x8e)
 
 Returns the version of a possible bootloader installed at the top of the