diff --git a/doc/src/fix_property_atom.txt b/doc/src/fix_property_atom.txt
index aef534ad25fcc1ea9e8d3aaddef04c9bd48a35e5..58a3c15cbfd2c9c02e665832d60a52a3499cffb4 100644
--- a/doc/src/fix_property_atom.txt
+++ b/doc/src/fix_property_atom.txt
@@ -111,6 +111,10 @@ need to communicate their new values to/from ghost atoms, an operation
 that can be invoked from within a "pair style"_pair_style.html or
 "fix"_fix.html or "compute"_compute.html that you write.
 
+NOTE: If this fix is defined _after_ the simulation box is created,
+a 'run 0' command should be issued to properly initialize the storage
+created by this fix.
+
 :line
 
 This fix is one of a small number that can be defined in an input
@@ -155,7 +159,7 @@ these commands could be used:
 
 fix prop all property/atom mol
 variable cluster atom ((id-1)/10)+1
-set id * mol v_cluster :pre
+set atom * mol v_cluster :pre
 
 The "atom-style variable"_variable.html will create values for atoms
 with IDs 31,32,33,...40 that are 4.0,4.1,4.2,...,4.9.  When the