Merge pull request #2315 from laujan/patch-4

Update custom-neural.md

Author: prmerger-automator[bot]

articles/ai-services/document-intelligence/train/custom-neural.md

@@ -63,7 +63,7 @@ Neural models support documents that have the same information, but different pa
 
 ### Signature detection
 
-Custom neural v4.0 2024-11-30 (GA) model supports signature detection. To label a signature, use field type as Signature and draw the regions for signature. Signature field only supports one draw region per field.
+Custom neural v4.0 2024-11-30 (GA) model supports signature detection. To label a signature, use field type as Signature and draw the regions for signature. Signature field only supports one draw region per field. To train a custom neural model with signature detection, you need to use at least **five samples** with signature labeled along with variations to get the most accurate results.
 
 ## Tabular fields