diff --git a/creatur.cabal b/creatur.cabal
--- a/creatur.cabal
+++ b/creatur.cabal
@@ -1,5 +1,5 @@
 Name:              creatur
-Version:           5.6.0
+Version:           5.6.1
 Stability:         experimental
 Synopsis:          Framework for artificial life experiments.
 Description:       A software framework for automating experiments
@@ -36,7 +36,7 @@
 source-repository this
   type:     git
   location: https://github.com/mhwombat/creatur.git
-  tag:      5.6.0
+  tag:      5.6.1
 
 library
   GHC-Options:      -Wall -fno-warn-orphans
diff --git a/src/ALife/Creatur/Task.hs b/src/ALife/Creatur/Task.hs
--- a/src/ALife/Creatur/Task.hs
+++ b/src/ALife/Creatur/Task.hs
@@ -108,6 +108,7 @@
 popSizeInBounds :: Universe u => (Int, Int) -> StateT u IO Bool
 popSizeInBounds (minAgents, maxAgents) = do
   n <- popSize
+  writeToLog $ "Pop. size=" ++ show n
   if n < minAgents
     then do
       writeToLog "Requesting shutdown (population too small)"