diff --git a/Documentation/TableofContents.md b/Documentation/TableofContents.md
index 44e2696..7d057de 100644
--- a/Documentation/TableofContents.md
+++ b/Documentation/TableofContents.md
@@ -16,7 +16,7 @@
 <br>**[2 Glossary of Terms](GlossaryofTerms.md)**
 <br>
 <br>**[3 Standardized Vocabularies](StandardizedVocabularies/StandardizedVocabularies.md)**
-<br>3.1 CONCEPT
+<br>[3.1 CONCEPT](StandardizedVocabularies/CONCEPT.md)
 <br>3.2 VOCABULARY
 <br>3.3 DOMAIN
 <br>3.4 CONCEPT_CLASS