diff --git a/infra/MarkdownTestReference.md b/infra/MarkdownTestReference.md
index 1dc34d1a..6d675e81 100644
--- a/infra/MarkdownTestReference.md
+++ b/infra/MarkdownTestReference.md
@@ -201,3 +201,13 @@ pie showData
 
 Based on counts of all files of the various types in all repositories in the
 GiellaLT infra.
+
+```mermaid
+%%{init: {"pie": {"textPosition": 0.5}, "themeVariables": {"pieOuterStrokeWidth": "5px"}} }%%
+pie showData
+    title Key elements in Product X
+    "Calcium" : 42.96
+    "Potassium" : 50.05
+    "Magnesium" : 10.01
+    "Iron" :  5
+```