diff --git a/docs/Users_Guide/data_io.rst b/docs/Users_Guide/data_io.rst
index b5e6b7765..076acce97 100644
--- a/docs/Users_Guide/data_io.rst
+++ b/docs/Users_Guide/data_io.rst
@@ -22,7 +22,7 @@ Tropical cyclone forecasts and observations are typically provided in a specific
 Requirements for CF Compliant NetCDF
 ------------------------------------
 
-The MET tools use following attributes and variables for input CF Compliant NetCDF data.
+The MET tools use following attributes and variables for input "`CF Compliant NetCDF data <https://cfconventions.org/`_".
 
 1. The global attribute "Conventions".