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-rw-r--r--docs/syscall_descriptions_syntax.md2
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diff --git a/docs/syscall_descriptions_syntax.md b/docs/syscall_descriptions_syntax.md
index 25b0e0e65..cb5249ab1 100644
--- a/docs/syscall_descriptions_syntax.md
+++ b/docs/syscall_descriptions_syntax.md
@@ -50,6 +50,8 @@ rest of the type-options are type-specific:
argname of the object
"bitsize": similar to "len", but always denotes the size in bits, type-options:
argname of the object
+"offsetof": offset of the field from the beginning of the parent struct, type-options:
+ field
"vma"/"vma64": a pointer to a set of pages (used as input for mmap/munmap/mremap/madvise), type-options:
optional number of pages (e.g. vma[7]), or a range of pages (e.g. vma[2-4])
vma64 has size of 8 bytes regardless of target pointer size