diff --git a/fieldExtraction/src/prompts/investment_prompts.json b/fieldExtraction/src/prompts/investment_prompts.json
index 27b0fd9..197ca2f 100644
--- a/fieldExtraction/src/prompts/investment_prompts.json
+++ b/fieldExtraction/src/prompts/investment_prompts.json
@@ -248,7 +248,7 @@
         "field_name": "NPI",
         "relationship": "one_to_one",
         "field_type": "provider_info",
-        "prompt": "What is the National Provider Identifier (NPI)? An NPI is a unique 10-digit identification number for healthcare providers. Look for it near provider information sections."
+        "prompt": "What is the National Provider Identifier (NPI)? An NPI is a unique 10-digit identification number for healthcare providers. Look for it near provider information sections. NEVER fill a number here that is not 10-digits."
     },
     {
         "field_name": "NAME",