diff --git a/doc/fix.html b/doc/fix.html
index 5414c3c1bc..104f6f7eda 100644
--- a/doc/fix.html
+++ b/doc/fix.html
@@ -193,7 +193,7 @@ list of fix styles available in LAMMPS:
 <LI><A HREF = "fix_nh.html">nph</A> - constant NPH time integration via Nose/Hoover
 <LI><A HREF = "fix_nph_asphere.html">nph/asphere</A> - NPH for aspherical particles
 <LI><A HREF = "fix_nph_sphere.html">nph/sphere</A> - NPH for spherical particles
-<LI><A HREF = "fix_nphug.html">nphug</A> - Constant-stress Hugoniostat integration
+<LI><A HREF = "fix_nphug.html">nphug</A> - constant-stress Hugoniostat integration
 <LI><A HREF = "fix_nh.html">npt</A> - constant NPT time integration via Nose/Hoover
 <LI><A HREF = "fix_npt_asphere.html">npt/asphere</A> - NPT for aspherical particles
 <LI><A HREF = "fix_npt_sphere.html">npt/sphere</A> - NPT for spherical particles
diff --git a/doc/fix.txt b/doc/fix.txt
index 428b377fa1..2d70d5dded 100644
--- a/doc/fix.txt
+++ b/doc/fix.txt
@@ -188,7 +188,7 @@ list of fix styles available in LAMMPS:
 "nph"_fix_nh.html - constant NPH time integration via Nose/Hoover
 "nph/asphere"_fix_nph_asphere.html - NPH for aspherical particles
 "nph/sphere"_fix_nph_sphere.html - NPH for spherical particles
-"nphug"_fix_nphug.html - Constant-stress Hugoniostat integration
+"nphug"_fix_nphug.html - constant-stress Hugoniostat integration
 "npt"_fix_nh.html - constant NPT time integration via Nose/Hoover
 "npt/asphere"_fix_npt_asphere.html - NPT for aspherical particles
 "npt/sphere"_fix_npt_sphere.html - NPT for spherical particles