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-rw-r--r--docs/syscall_descriptions_syntax.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/syscall_descriptions_syntax.md b/docs/syscall_descriptions_syntax.md
index 4376dbd16..5bd20ebe2 100644
--- a/docs/syscall_descriptions_syntax.md
+++ b/docs/syscall_descriptions_syntax.md
@@ -30,8 +30,9 @@ rest of the type-options are type-specific:
reference to flags description (see below)
"array": a variable/fixed-length array, type-options:
type of elements, optional size (fixed "5", or ranged "5:10", boundaries inclusive)
-"ptr": a pointer to an object, type-options:
+"ptr"/"ptr64": a pointer to an object, type-options:
type of the object; direction (in/out/inout)
+ ptr64 has size of 8 bytes regardless of target pointer size
"buffer": a pointer to a memory buffer (like read/write buffer argument), type-options:
direction (in/out/inout)
"string": a zero-terminated memory buffer (no pointer indirection implied), type-options: