diff --git a/doomsday argument.md b/doomsday argument.md
index 12959ef11..52d72418d 100644
--- a/doomsday argument.md	
+++ b/doomsday argument.md	
@@ -1,5 +1,5 @@
 - a [[philosophical argument]].
   - by [[Brandon Carter]] and [[John Leslie]] and [[Richard Gott]].
   - "Because a random human would tend to find themselves in the middle of the population of all humans to exist…" 
-    - There is the [[reference class]] issue.
-    - And why does it imply really we are near extinction, instead of a bit later than halfway? (population growth is accelerating but I think overall ~100 billion humans are expected to have lived so far, and we are only 7 billion currently.)
+    - Why does it imply really we are near extinction, instead of a bit later than halfway? (population growth is accelerating but I think overall ~100 billion humans are expected to have lived so far, and we are only 7 billion currently.)
+    - There is the possible [[reference class]] issue, as pointed out by [[Claude]].