diff --git a/notsof.md b/notsof.md
index 7a22a40b7..7603e885d 100644
--- a/notsof.md
+++ b/notsof.md
@@ -95,4 +95,5 @@
 - [[probabilities]] enter the stage! Finally. They seem to make sense in this context.
   - as usual, when probabilities are independent all's nice and well.
   - [[pearson correlation coefficient]] 
+  - some correlations are intrinsic, some are circumstantial
    
\ No newline at end of file