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diff --git a/doc/abi/x86 b/doc/abi/x86
index fd0c51a..c62911d 100644
--- a/doc/abi/x86
+++ b/doc/abi/x86
@@ -19,13 +19,13 @@ Out-of-Process Method Invocation:
       
    Callee:
       eax: pointer to PIB
-      edx: pointer to caller information struct, if such was
-           requested
+      edx: pointer to caller information struct, or NULL if not
+           requested.
+      esp: NULL.
 
       Jump to the 32-bit address stored at 0x7fff0004 to return.
       
       Upon return:
       eax: pointer to exception, or NULL if none.
       edx: length of exception segment, if any
-      ebx, esi, edi, ebp, esp: should be preserved
-      ecx: may be clobbered
+      ebx, esi, edi, ebp, esp: may be clobbered