diff --git a/docs/api/cyclone/foreign.md b/docs/api/cyclone/foreign.md
index 694e8c3f..d0c7aa67 100644
--- a/docs/api/cyclone/foreign.md
+++ b/docs/api/cyclone/foreign.md
@@ -74,4 +74,5 @@ Scheme | C
 `double` | `double`
 `bignum` | `mp_int`
 `opaque` | `void *`
+`cvoid` | `void`