diff --git a/src/SHOCK/fix_append_atoms.cpp b/src/SHOCK/fix_append_atoms.cpp
index b2bd280dbf..aed386cee3 100644
--- a/src/SHOCK/fix_append_atoms.cpp
+++ b/src/SHOCK/fix_append_atoms.cpp
@@ -64,31 +64,31 @@ FixAppendAtoms::FixAppendAtoms(LAMMPS *lmp, int narg, char **arg) :
   iarg = 3;
   while (iarg < narg) {
     if (strcmp(arg[iarg],"xlo") == 0) {
-      error->all(FLERR,"Only zhi currently implemented for append_atoms");
+      error->all(FLERR,"Only zhi currently implemented for fix append_atoms");
       xloflag = 1;
       iarg++;
       if (domain->boundary[0][0] != 3) 
 	error->all(FLERR,"Append boundary must be shrink/minimum");
     } else if (strcmp(arg[iarg],"xhi") == 0) {
-      error->all(FLERR,"Only zhi currently implemented for append_atoms");
+      error->all(FLERR,"Only zhi currently implemented for fix append_atoms");
       xhiflag = 1;
       iarg++;
       if (domain->boundary[0][1] != 3) 
 	error->all(FLERR,"Append boundary must be shrink/minimum");
     } else if (strcmp(arg[iarg],"ylo") == 0) {
-      error->all(FLERR,"Only zhi currently implemented for append_atom");
+      error->all(FLERR,"Only zhi currently implemented for fix append_atoms");
       yloflag = 1;
       iarg++;
       if (domain->boundary[1][0] != 3) 
 	error->all(FLERR,"Append boundary must be shrink/minimum");
     } else if (strcmp(arg[iarg],"yhi") == 0) {
-      error->all(FLERR,"Only zhi currently implemented for append_atom");
+      error->all(FLERR,"Only zhi currently implemented for fix append_atoms");
       yhiflag = 1;
       iarg++;
       if (domain->boundary[1][1] != 3) 
 	error->all(FLERR,"Append boundary must be shrink/minimum");
     } else if (strcmp(arg[iarg],"zlo") == 0) {
-      error->all(FLERR,"Only zhi currently implemented for append_atom");
+      error->all(FLERR,"Only zhi currently implemented for fix append_atoms");
       zloflag = 1;
       iarg++;
       if (domain->boundary[2][0] != 3) 
diff --git a/src/SHOCK/fix_append_atoms.h b/src/SHOCK/fix_append_atoms.h
index 8459cd1680..5009e8f908 100644
--- a/src/SHOCK/fix_append_atoms.h
+++ b/src/SHOCK/fix_append_atoms.h
@@ -63,9 +63,9 @@ Self-explanatory.  Check the input script syntax and compare to the
 documentation for the command.  You can use -echo screen as a
 command-line option when running LAMMPS to see the offending line.
 
-E: Only zhi currently implemented for append_atoms
+E: Only zhi currently implemented for fix append_atoms
 
-The face keyword must be zhi.
+Self-explanatory.
 
 E: Append boundary must be shrink/minimum