diff --git a/postprocessor.py b/postprocessor.py
index 0a9211a..69e6386 100644
--- a/postprocessor.py
+++ b/postprocessor.py
@@ -249,7 +249,7 @@ class PostProcessor(HDF5Container):
             verbose=self.pp_params.pymses.verbose,
         )
         self._amr = self._ro.amr_source(self.pp_params.pymses.variables)
-        self._part = self._ro.particle_source(["vel", "mass"])
+        self._part = self._ro.particle_source(self.pp_params.pymses.part_variables)
 
         if self.pp_params.pymses.filter:
             self.min_coords = np.array(self.pp_params.pymses.min_coords)
diff --git a/pp_params.yml b/pp_params.yml
index 6a62655..e545c2c 100644
--- a/pp_params.yml
+++ b/pp_params.yml
@@ -42,7 +42,8 @@ filaments:  # parameters for FilFinder
 pymses: # Parameters for Pymses reader
 
     # Source settings
-    variables :  ["rho","vel","Br","Bl","P", "g", "phi"]  # Read these variables
+    variables :  ["rho","vel","Br","Bl","P", "g", "phi"]  # Read these grid variables
+    part_variables :  ["vel","mass","id","level","epoch", "metal"]  # Read these particles variables
     order     : '<'                                       # Bit order