diff --git a/charter/values.md b/charter/values.md
index ffbdab7..4b6e882 100644
--- a/charter/values.md
+++ b/charter/values.md
@@ -4,10 +4,14 @@ Expert. Enabling. Fearless.
 
 # Principles
 
-*Open by default*
+### Open by default
 
-Materials created by the organisation shall be published as Open Data by default, using Open Data Certificates where appropriate.  
+**Data** released by the ODI shall be published as Open Data by default, using Open Data Certificates where appropriate.  
 
-*Personal data*
+**Materials** created by the ODI shall be published with a Creative Common licence, using attribution and share-alike as default.  
+
+### Personal data
 
 Personal data is not Open Data without explicit and informed opt-in from the individual(s) concerned.
+
+[Here is more information](https://github.com/theodi/data-definitions#open-and-personal) on how personal data relates to open data.
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