diff --git a/docs/src/index.md b/docs/src/index.md
index 29b73086..4fde7b04 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -47,6 +47,9 @@ bfmi
 
 ## Other diagnostics
 
+!!! note
+    These diagnostics are older and less widely used.
+
 ```@docs
 discretediag
 gelmandiag