diff --git a/ai.go b/ai.go
index e66a0cc..55a5fe2 100644
--- a/ai.go
+++ b/ai.go
@@ -165,6 +165,12 @@ func AnalyzeWithVision(imageData []byte) (*DocumentAnalysis, error) {
 
 IMPORTANT: The full_text field MUST contain the verbatim transcription in the document's original language. This is non-negotiable.
 
+**Known proper nouns** (use these exact spellings when you see similar handwriting):
+- Jongsma (surname — may look like "Jongoma", "Jongsoma", "Jongma")
+- Johan (first name)
+- Tatyana / Tanya (first name)
+- St. Petersburg, Florida (city — not Russia)
+
 Respond in JSON ONLY:
 {"category": "...", "doc_type": "...", "date": "...", "vendor": "...", "amount": "...", "title": "...", "summary": "...", "full_text": "..."}`