diff --git a/src/FLD/pair_brownian.h b/src/FLD/pair_brownian.h
index 99fad06a14..6fbd74e760 100644
--- a/src/FLD/pair_brownian.h
+++ b/src/FLD/pair_brownian.h
@@ -71,6 +71,10 @@ 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.
 
+W: Cannot include log terms without 1/r terms; setting flagHI to 1
+
+Self-explanatory.
+
 E: Incorrect args for pair coefficients
 
 Self-explanatory.  Check the input script or data file.
diff --git a/src/FLD/pair_lubricate.h b/src/FLD/pair_lubricate.h
index eb2d3ee228..2a7f1bf70c 100644
--- a/src/FLD/pair_lubricate.h
+++ b/src/FLD/pair_lubricate.h
@@ -72,6 +72,10 @@ 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.
 
+W: Cannot include log terms without 1/r terms; setting flagHI to 1
+
+Self-explanatory.
+
 E: Incorrect args for pair coefficients
 
 Self-explanatory.  Check the input script or data file.
diff --git a/src/FLD/pair_lubricateU.h b/src/FLD/pair_lubricateU.h
index ca8f15a232..9141170dd1 100644
--- a/src/FLD/pair_lubricateU.h
+++ b/src/FLD/pair_lubricateU.h
@@ -87,6 +87,10 @@ 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.
 
+W: Cannot include log terms without 1/r terms; setting flagHI to 1.
+
+Self-explanatory.
+
 E: Incorrect args for pair coefficients
 
 Self-explanatory.  Check the input script or data file.
diff --git a/src/FLD/pair_lubricateU_poly.h b/src/FLD/pair_lubricateU_poly.h
index 755788b718..6c8fa9cc9f 100644
--- a/src/FLD/pair_lubricateU_poly.h
+++ b/src/FLD/pair_lubricateU_poly.h
@@ -56,6 +56,10 @@ 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.
 
+W: Cannot include log terms without 1/r terms; setting flagHI to 1
+
+Self-explanatory.
+
 E: Pair lubricateU/poly requires newton pair off
 
 Self-explanatory.
diff --git a/src/FLD/pair_lubricate_poly.cpp b/src/FLD/pair_lubricate_poly.cpp
index cb4e65d5a2..47909db667 100644
--- a/src/FLD/pair_lubricate_poly.cpp
+++ b/src/FLD/pair_lubricate_poly.cpp
@@ -476,8 +476,8 @@ void PairLubricatePoly::init_style()
   // check for fix deform, if exists it must use "remap v"
   // If box will change volume, set appropriate flag so that volume
   // and v.f. corrections are re-calculated at every step.
-  //
-  // If available volume is different from box volume
+
+  // if available volume is different from box volume
   // due to walls, set volume appropriately; if walls will
   // move, set appropriate flag so that volume and v.f. corrections
   // are re-calculated at every step.
diff --git a/src/FLD/pair_lubricate_poly.h b/src/FLD/pair_lubricate_poly.h
index 28103b9f64..762d86f6e6 100644
--- a/src/FLD/pair_lubricate_poly.h
+++ b/src/FLD/pair_lubricate_poly.h
@@ -55,6 +55,10 @@ E: Pair lubricate/poly requires extended particles
 
 One of the particles has radius 0.0.
 
+E: Using pair lubricate with inconsistent fix deform remap option
+
+Must use remap v option with fix deform with this pair style.
+
 E: Using pair lubricate/poly with inconsistent fix deform remap option
 
 If fix deform is used, the remap v option is required.
diff --git a/src/KSPACE/ewald.h b/src/KSPACE/ewald.h
index fbeb812cb8..2e0c8b3aba 100644
--- a/src/KSPACE/ewald.h
+++ b/src/KSPACE/ewald.h
@@ -119,4 +119,12 @@ W: System is not charge neutral, net charge = %g
 The total charge on all atoms on the system is not 0.0, which
 is not valid for Ewald or PPPM.
 
+E: KSpace accuracy too large to estimate G vector
+
+UNDOCUMENTED
+
+E: Cannot (yet) use Kspace slab correction with compute group/group
+
+UNDOCUMENTED
+
 */
diff --git a/src/KSPACE/pair_lj_cut_coul_long_tip4p.h b/src/KSPACE/pair_lj_cut_coul_long_tip4p.h
index 008dd30140..b078ae75c2 100644
--- a/src/KSPACE/pair_lj_cut_coul_long_tip4p.h
+++ b/src/KSPACE/pair_lj_cut_coul_long_tip4p.h
@@ -57,6 +57,16 @@ class PairLJCutCoulLongTIP4P : public PairLJCutCoulLong {
 
 /* ERROR/WARNING messages:
 
+E: TIP4P hydrogen is missing
+
+The TIP4P pairwise computation failed to find the correct H atom
+within a water molecule.
+
+E: TIP4P hydrogen has incorrect atom type
+
+The TIP4P pairwise computation found an H atom whose type does not
+agree with the specified H type.
+
 E: Illegal ... command
 
 Self-explanatory.  Check the input script syntax and compare to the
@@ -92,14 +102,9 @@ E: Must use an angle style with TIP4P potential
 TIP4P potentials assume angles in water are constrained by a fix shake
 command.
 
-E: TIP4P hydrogen is missing
+E: Water H epsilon must be 0.0 for pair style lj/cut/coul/long/tip4p
 
-The TIP4P pairwise computation failed to find the correct H atom
-within a water molecule.
-
-E: TIP4P hydrogen has incorrect atom type
-
-The TIP4P pairwise computation found an H atom whose type does not
-agree with the specified H type.
+This is because LAMMPS does not compute the Lennard-Jones interactions
+with these particles for efficiency reasons.
 
 */
diff --git a/src/KSPACE/pppm.h b/src/KSPACE/pppm.h
index 6a51d68238..25407fb7fb 100644
--- a/src/KSPACE/pppm.h
+++ b/src/KSPACE/pppm.h
@@ -196,9 +196,9 @@ E: Incorrect boundaries with slab PPPM
 Must have periodic x,y dimensions and non-periodic z dimension to use
 2d slab option with PPPM.
 
-E: PPPM order cannot be greater than %d
+E: PPPM order cannot be < 2 or > than %d
 
-Self-explanatory.
+This is a limitation of the PPPM implementation in LAMMPS.
 
 E: KSpace style is incompatible with Pair style
 
@@ -245,6 +245,10 @@ to run, but can reduce the order no further.  Try increasing the
 accuracy of PPPM by reducing the tolerance size, thus inducing a
 larger PPPM grid.
 
+E: KSpace accuracy too large to estimate G vector
+
+UNDOCUMENTED
+
 E: Cannot compute PPPM G
 
 LAMMPS failed to compute a valid approximation for the PPPM g_ewald
@@ -266,4 +270,8 @@ outside a processor's sub-domain or even the entire simulation box.
 This indicates bad physics, e.g. due to highly overlapping atoms, too
 large a timestep, etc.
 
+E: Cannot (yet) use K-space slab correction with compute group/group
+
+This option is not yet supported.
+
 */
diff --git a/src/MANYBODY/pair_bop.h b/src/MANYBODY/pair_bop.h
index 7aba29a9ea..593f4ce288 100644
--- a/src/MANYBODY/pair_bop.h
+++ b/src/MANYBODY/pair_bop.h
@@ -220,16 +220,59 @@ class PairBOP : public Pair {
 #endif
 #endif
 
-/*   ERROR/WARNING messages:
  
 E: BOP: Too many Atom Pairs
 
-The number of atomic pairs exceeds the expected number.  Check 
-your atomic structure to ensure that it is realistic.  
 
 E: BOP: Too many Atom Triplets
 
-The number of three atom groups for angle determinations 
-exceeds the expected number.  Check your atomic structrure
-to ensure that it is realistic.
+*/
+
+/* ERROR/WARNING messages:
+
+E: Illegal ... command
+
+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: Incorrect args for pair coefficients
+
+Self-explanatory.  Check the input script or data file.
+
+E: Pair style BOP requires atom IDs
+
+This is a requirement to use the BOP potential.
+
+E: Pair style BOP requires newton pair on
+
+See the newton command.  This is a restriction to use the BOP
+potential.
+
+E: Pair style bop requires comm ghost cutoff at least 3x larger than %g
+
+Use the communicate ghost command to set this.  See the pair bop
+doc page for more details.
+
+E: All pair coeffs are not set
+
+All pair coefficients must be set in the data file or by the
+pair_coeff command before running a simulation.
+
+E: Too many atom pairs for pair bop
+
+The number of atomic pairs exceeds the expected number.  Check your
+atomic structure to ensure that it is realistic.
+
+E: Too many atom triplets for pair bop
+
+The number of three atom groups for angle determinations exceeds the
+expected number.  Check your atomic structrure to ensure that it is
+realistic.
+
+E: Cannot open BOP potential file %s
+
+The specified BOP potential file cannot be opened.  Check that the
+path and name are correct.
+
 */
diff --git a/src/OPT/pair_lj_cut_coul_long_tip4p_opt.h b/src/OPT/pair_lj_cut_coul_long_tip4p_opt.h
index 0b8df5e842..26257f08f8 100644
--- a/src/OPT/pair_lj_cut_coul_long_tip4p_opt.h
+++ b/src/OPT/pair_lj_cut_coul_long_tip4p_opt.h
@@ -51,4 +51,9 @@ E: TIP4P hydrogen is missing
 The TIP4P pairwise computation failed to find the correct H atom
 within a water molecule.
 
+E: TIP4P hydrogen has incorrect atom type
+
+The atom LAMMPS assumes is a hydrogen bonded to a water oxygen,
+is not the hydrogen type specified in the command.
+
 */