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-rw-r--r--src/doc/guide-ffi.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/doc/guide-ffi.md b/src/doc/guide-ffi.md
index 9f2f2b34c2e..81616c675de 100644
--- a/src/doc/guide-ffi.md
+++ b/src/doc/guide-ffi.md
@@ -493,6 +493,7 @@ are:
 * `rust-intrinsic`
 * `system`
 * `C`
+* `win64`
 
 Most of the abis in this list are self-explanatory, but the `system` abi may
 seem a little odd. This constraint selects whatever the appropriate ABI is for