diff --git a/doc/src/compute_smd_rho.rst b/doc/src/compute_smd_rho.rst
index 8ecb09f318..5f6a9120a7 100644
--- a/doc/src/compute_smd_rho.rst
+++ b/doc/src/compute_smd_rho.rst
@@ -45,7 +45,8 @@ Restrictions
 """"""""""""
 
 This compute is part of the MACHDYN package. It is only enabled if
-LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
+LAMMPS was built with that package. See the :doc:`Build package
+<Build_package>` page for more info.
 
 Related commands
 """"""""""""""""
diff --git a/doc/src/compute_smd_vol.rst b/doc/src/compute_smd_vol.rst
index 94372c23ce..1955111be1 100644
--- a/doc/src/compute_smd_vol.rst
+++ b/doc/src/compute_smd_vol.rst
@@ -24,7 +24,7 @@ Description
 """""""""""
 
 Define a computation that provides the per-particle volume and the sum
-of the per-particle volumes of the group for which the fix is defined.
+of the per-particle volumes of the group for which the compute is defined.
 
 See `this PDF guide <PDF/MACHDYN_LAMMPS_userguide.pdf>`_ to using Smooth
 Mach Dynamics in LAMMPS.
@@ -41,13 +41,14 @@ The per-particle vector values will be given in :doc:`units <units>` of
 volume.
 
 Additionally, the compute returns a scalar, which is the sum of the
-per-particle volumes of the group for which the fix is defined.
+per-particle volumes of the group for which the compute is defined.
 
 Restrictions
 """"""""""""
 
 This compute is part of the MACHDYN package.  It is only enabled if
-LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
+LAMMPS was built with that package. See the :doc:`Build package
+<Build_package>` page for more info.
 
 Related commands
 """"""""""""""""
diff --git a/src/MACHDYN/compute_smd_vol.cpp b/src/MACHDYN/compute_smd_vol.cpp
index cc7dbe441f..4368e108bf 100644
--- a/src/MACHDYN/compute_smd_vol.cpp
+++ b/src/MACHDYN/compute_smd_vol.cpp
@@ -25,13 +25,14 @@
 
 #include "compute_smd_vol.h"
 
-#include <cstring>
 #include "atom.h"
-#include "update.h"
-#include "modify.h"
 #include "comm.h"
-#include "memory.h"
 #include "error.h"
+#include "memory.h"
+#include "modify.h"
+#include "update.h"
+
+#include <cstring>
 
 using namespace LAMMPS_NS;
 
@@ -39,12 +40,12 @@ using namespace LAMMPS_NS;
 
 ComputeSMDVol::ComputeSMDVol(LAMMPS *lmp, int narg, char **arg) :
                 Compute(lmp, narg, arg) {
-        if (narg != 3)
-                error->all(FLERR, "Illegal compute smd/volume command");
+        if (narg != 3) error->all(FLERR, "Illegal compute smd/volume command");
         if (atom->vfrac_flag != 1)
-                error->all(FLERR, "compute smd/volume command requires atom_style with density (e.g. smd)");
+          error->all(FLERR, "compute smd/volume command requires atom_style with density (e.g. smd)");
 
         scalar_flag = 1;
+        extscalar = 1;
         peratom_flag = 1;
         size_peratom_cols = 0;