Update README.md

Author: stephanieshong

redCapDataDictionaryWithExtension/README.md

@@ -24,7 +24,7 @@
 **Notes**:
 - Concept IDs are mapped to the OHDSI Athena vocabulary. URLs are provided for reference, but specific Concept Codes (e.g., SNOMED CT, LOINC, AI-READI custom concepts) are pending confirmation.
 - These questions align with AI-READI's focus on diabetes-related distress and social determinants of health, mapped to standard terminologies for interoperability.
-- For full REDCap dictionary data element mapping details, see the [Core REDCap Data Dictionary Data Element Mapping Structure](#core-redcap-data-dictionary-structure) section.
+- For full REDCap dictionary data element mapping details, see the [Core REDCap Data Dictionary Data Element Mapping Structure](https://github.com/AI-READI/DataElementMaps/blob/main/redCapDataDictionaryWithExtension/redcap-data-dictionary/_master_red_cap_data_dictionary_with_extensions.csv) section.
 
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