diff --git a/content/projects/noxos/docs/sysabi.md b/content/projects/noxos/docs/sysabi.md
index 7d600e5..b4b9ed7 100644
--- a/content/projects/noxos/docs/sysabi.md
+++ b/content/projects/noxos/docs/sysabi.md
@@ -35,9 +35,10 @@ The following calls should be implemented to some degree in noxos 1.0.
 **Note:** The _len_ argument of paths isn't used at the moment, rather than using _len_, _path_ needs to be Null-Terminated.
 
 ## Memory
-| ID  | Name | Description | Arg1 | Arg2 | Arg3 | Arg4 | Result | Status | 
-|-----|------|-------------|------|------|------|------|--------|--------|
-|     |      |             |      |      |      |      |        |        |
+| ID     | Name      | Description                                                                                                                               | Arg1 | Arg2 | Arg3  | Arg4 | Result | Status | 
+|--------|-----------|-------------------------------------------------------------------------------------------------------------------------------------------|------|------|-------|------|--------|--------|
+| 0x0201 | nx_mmap   | Maps _n_ 4KB pages to address _addr_. You can provide a bitmap of flags with the _flags_ argument. Which flags can be is described below. | addr | n    | flags |      | status | N/A    |
+| 0x0202 | nx_munmap | Unmaps _n_ 4KB pages at address _addr_.                                                                                                   | addr | n    |       |      | status | N/A    |
 
 ## Processes
 | ID  | Name | Description | Arg1 | Arg2 | Arg3 | Arg4 | Result | Status | 
@@ -73,3 +74,11 @@ If another process calls them, they will just return without doing anything.
 |-----|---------------|--------------------------------------------|-----------|--------|
 | 0   | `permissions` | Who has what permission to access the file | uint16_t  | N/A    |
 | 1   | `size`        | The files size in bytes                    | uint64_t  | N/A    |
+
+
+### Memory mapping flags
+
+| Bit | Name      | Description                               |
+|-----|-----------|-------------------------------------------|
+| 0   | `write`   | Enables write access to the mapped pages. |
+| 1   | `no_exec` | Prevents execution of the mapped pages.   |