diff --git a/specification.md b/specification.md
index ff27adfd93..adb6335b61 100644
--- a/specification.md
+++ b/specification.md
@@ -1598,7 +1598,7 @@ Appendix III: Hierarchical Event Descriptor (HED) Tags
 ======================================================
 
 Each event can be assigned one or more Hierarchical Event Descriptor (HED) Tag (see [https://github.com/BigEEGConsortium/HED/wiki/HED-Schema](https://github.com/BigEEGConsortium/HED-schema/wiki/HED-Schema) for more details) under the optional `HED` column.
-HED is a controlled vocabulary of terms describing events in a behavioural paradigm. It was originally developed with EEG in mind, but is applicable to all behavioural experiments. Each level of the hierarchical tags are delimited with a forward slash ("/"). Multiple tags are delimited with a comma. Parentheses (brackets) group tags and enable specification of multiple items and their attributes in a single HED string (see section 2.4 in HED Tagging Strategy Guide - [http://www.hedtags.org/downloads/HED%20Tagging%20Strategy%20Guide.pdf](http://www.hedtags.org/downloads/HED%20Tagging%20Strategy%20Guide.pdf)). For more information about HED and tools available to validate and match HED strings, please visit [www.hedtags.org](http://www.hedtags.org).
+HED is a controlled vocabulary of terms describing events in a behavioural paradigm. It was originally developed with EEG in mind, but is applicable to all behavioural experiments. Each level of the hierarchical tags are delimited with a forward slash ("/"). Multiple tags are delimited with a comma. Parentheses (brackets) group tags and enable specification of multiple items and their attributes in a single HED string (see section 2.4 in [HED Tagging Strategy Guide](http://www.hedtags.org/downloads/HED%20Tagging%20Strategy%20Guide.pdf)). For more information about HED and tools available to validate and match HED strings, please visit [www.hedtags.org](http://www.hedtags.org).
 
 Since dedicated fields already exist for the overall task classification (`CogAtlasID` and `CogPOID`) in the sidecar JSON files HED
 tags from the Paradigm subcategory should not be used to annotate