diff --git a/Tools/HDFView/README.md b/Tools/HDFView/README.md
index fafdbb4..3e0a9eb 100644
--- a/Tools/HDFView/README.md
+++ b/Tools/HDFView/README.md
@@ -2,6 +2,8 @@
 
 ## Notations
 
+See https://gitlab.psi.ch/Pmodules/documentation/wikis/Development/Notations
+
 `$PMODULES_ROOT`: root of Pmodules environment. At PSI this is `/opt/psi`.
 
 `$GRP`: group the module is installed in, here 'Tools'