diff --git a/scripts/build-doc-site.mjs b/scripts/build-doc-site.mjs
index 2fdb30ca..03e9f122 100644
--- a/scripts/build-doc-site.mjs
+++ b/scripts/build-doc-site.mjs
@@ -69,6 +69,7 @@ const SECTIONS = [
       ["context/code/gp.md", "code/gp", "gp-tree and improvise-gp"],
       ["context/code/numtower.md", "code/numtower", "numtower, the numeric tower"],
       ["context/code/zset.md", "code/zset", "zset, the Z-set group"],
+      ["context/code/zset-ffi.md", "code/zset-ffi", "zset-ffi, the C ABI"],
       ["context/code/improvise-incremental.md", "code/improvise-incremental", "improvise-incremental, the plug"],
       ["context/code/kb-tool.md", "code/kb-tool", "The kb tool"],
       ["context/code/tooling.md", "code/tooling", "The repository's own checkers"],
@@ -90,6 +91,7 @@ const SECTIONS = [
       ["context/test-evidence/gp.md", "test-evidence/gp", "gp-tree and improvise-gp"],
       ["context/test-evidence/numtower.md", "test-evidence/numtower", "numtower"],
       ["context/test-evidence/zset.md", "test-evidence/zset", "zset"],
+      ["context/test-evidence/zset-ffi.md", "test-evidence/zset-ffi", "zset-ffi"],
       ["context/test-evidence/improvise-incremental.md", "test-evidence/improvise-incremental", "improvise-incremental"],
       ["context/test-evidence/tooling.md", "test-evidence/tooling", "The repository's own gates"],
       ["context/test-evidence/layout-cost.md", "test-evidence/layout-cost", "Layout and keypress cost"],