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diff --git a/doc/comboot.txt b/doc/comboot.txt
index eb43708..13d18f6 100644
--- a/doc/comboot.txt
+++ b/doc/comboot.txt
@@ -949,3 +949,20 @@ AX=0024h [3.80] Cleanup, shuffle and boot, raw version
with read/write data segments, matching the respective code
segment. For mode 0, B=0 and the limits will be 64K, for mode
1, B=1 and the limits will be 4 GB.
+
+
+AX=0025h [3.84] Set current working directory
+ Input: AX 00025h
+ ES:BX null-terminated directory name string
+ Output: None
+
+ Sets the current working directory. For SYSLINUX, ISOLINUX,
+ and PXELINUX, this will be an absolute path.
+
+
+AX=0026h [3.84] Read file system metadata [ISOLINUX]
+ Input: AX 00026h
+ Output: None
+
+ Reads filesystem data (e.g. after a CDROM change).
+
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