diff --git a/env/DAMASK.csh b/env/DAMASK.csh
index 26e2dd8a2..07b4b6817 100644
--- a/env/DAMASK.csh
+++ b/env/DAMASK.csh
@@ -19,7 +19,9 @@ if ( "x$DAMASK_NUM_THREADS" == "x" ) then
 endif
 
 # currently, there is no information that unlimited causes problems
-# still,  http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# still, http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# more info https://jblevins.org/log/segfault
+#           https://stackoverflow.com/questions/79923/what-and-where-are-the-stack-and-heap
 # http://superuser.com/questions/220059/what-parameters-has-ulimit
 limit datasize  unlimited  # maximum  heap size (kB)
 limit stacksize unlimited  # maximum stack size (kB)
diff --git a/env/DAMASK.sh b/env/DAMASK.sh
index 509f5f1b7..663e9a4b3 100644
--- a/env/DAMASK.sh
+++ b/env/DAMASK.sh
@@ -42,7 +42,9 @@ PROCESSING=$(type -p postResults || true 2>/dev/null)
 [ "x$DAMASK_NUM_THREADS" == "x" ] && DAMASK_NUM_THREADS=1
 
 # currently, there is no information that unlimited causes problems
-# still,  http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# still, http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# more info https://jblevins.org/log/segfault
+#           https://stackoverflow.com/questions/79923/what-and-where-are-the-stack-and-heap
 # http://superuser.com/questions/220059/what-parameters-has-ulimit
 ulimit -d unlimited 2>/dev/null # maximum  heap size (kB)
 ulimit -s unlimited 2>/dev/null # maximum stack size (kB)
diff --git a/env/DAMASK.zsh b/env/DAMASK.zsh
index 3ceeb116a..43f682865 100644
--- a/env/DAMASK.zsh
+++ b/env/DAMASK.zsh
@@ -33,7 +33,9 @@ PROCESSING=$(which postResults || true 2>/dev/null)
 [ "x$DAMASK_NUM_THREADS" = "x" ] && DAMASK_NUM_THREADS=1
 
 # currently, there is no information that unlimited causes problems
-# still,  http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# still, http://software.intel.com/en-us/forums/topic/501500 suggest to fix it
+# more info https://jblevins.org/log/segfault
+#           https://stackoverflow.com/questions/79923/what-and-where-are-the-stack-and-heap
 # http://superuser.com/questions/220059/what-parameters-has-ulimit
 ulimit -d unlimited 2>/dev/null # maximum  heap size (kB)
 ulimit -s unlimited 2>/dev/null # maximum stack size (kB)