Update how-to-call-for-conversations.md

Author: BaherAbdullah

articles/cognitive-services/language-service/personally-identifiable-information/how-to-call-for-conversations.md

@@ -45,6 +45,9 @@ The API will attempt to detect all the [defined entity categories](concepts/conv
 
 For spoken transcripts, the entities detected will be returned on the `redactionSource` parameter value provided. Currently, the supported values for `redactionSource` are `text`, `lexical`, `itn`, and `maskedItn` (which maps to Microsoft Speech to Text API's `display`\\`displayText`, `lexical`, `itn` and `maskedItn` format respectively). Additionally, for the spoken transcript input, this API will also provide audio timing information to empower audio redaction. For using the audioRedaction feature, use the optional `includeAudioRedaction` flag with `true` value. The audio redaction is performed based on the lexical input format.
 
+> [!NOTE]
+> Conversation PII now supports 40,000 characters as document size.
+
 
 ## Getting PII results