diff --git a/docs/EXTRACTION-ISOLATION.md b/docs/EXTRACTION-ISOLATION.md
index 530d28a..dba3dd0 100644
--- a/docs/EXTRACTION-ISOLATION.md
+++ b/docs/EXTRACTION-ISOLATION.md
@@ -202,3 +202,16 @@ benchmark and decoder tests were ignored. The previously intermittent parent
 fixture passed in this serial run without changing product deadlines. This
 does not replace separately executed genuine Google package checks or close
 platform/GPU/visual gates.
+
+## Small-document throughput observation
+
+The published Linux CLI/helper indexed 100 synthetic documents on Ubuntu WSL
+(50 identical one-page PDFs, 50 identical one-paragraph DOCX files, 47950 total
+input bytes). CPU only, no semantic inference. Initial index: 0.893 seconds,
+100 indexed, zero extraction failures. Unchanged byte-verifying rescan: 0.0124
+seconds, 100 unchanged, zero failures. Both timings include CLI startup and
+SQLite work; they do not isolate parser startup or represent large real documents,
+Windows throughput, cold filesystem caches or steady-state search latency.
+No persistent parser/cache optimization is justified by this small observation.
+Raw ignored report: `.searchi/qa/document-throughput-013.json`, SHA-256
+`b86df0bf2ca0953317033b35b4642e6e0fadb93e50c499a7a28b1ae82512acd1`.