diff --git a/DataGuide_AAPF_HSI.md b/DataGuide_AAPF_HSI.md
index 73e0e07..085580a 100644
--- a/DataGuide_AAPF_HSI.md
+++ b/DataGuide_AAPF_HSI.md
@@ -14,7 +14,7 @@ This document details the file system organization and navigation procedures for
 - [How to Read Header Summary (header_summary_plants.csv, header_summary_ref.csv)](#how-to-read-information-in-header-summary-header_summary_plantscsv-header_summary_refcsv)
 - [How to Read Hyperspectral Data Processing Summary (.csv)](#how-to-read-hyperspectral-data-processing-summary-csv)
 - [Interpretation of VNIR-SWIR Coregistration Quality Assessment (.gif)](#interpretation-of-animated-gif-files-for-vnir-swir-coregistration-quality-assessment)
-- [How to Read Information in Spreadsheet file (.xlsx, masterfile)](#how-to-read-information-in-masterfile-file-xlsx-spreadsheet)
+- [How to Read Information in Masterfile (.xlsx, spreadsheet)](#how-to-read-information-in-masterfile-file-xlsx-spreadsheet)
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