diff --git a/doc/src/fix_widom.rst b/doc/src/fix_widom.rst
index 4ad48c119d..dd18bad3b2 100644
--- a/doc/src/fix_widom.rst
+++ b/doc/src/fix_widom.rst
@@ -189,7 +189,7 @@ the :doc:`run <run>` command.  This fix is not invoked during :doc:`energy minim
 Restrictions
 """"""""""""
 
-This fix is part of the USER-MISC package.  It is only enabled if LAMMPS was
+This fix is part of the MC package.  It is only enabled if LAMMPS was
 built with that package.  See the :doc:`Build package <Build_package>`
 doc page for more info.
 
diff --git a/src/USER-MISC/fix_widom.cpp b/src/MC/fix_widom.cpp
similarity index 100%
rename from src/USER-MISC/fix_widom.cpp
rename to src/MC/fix_widom.cpp
diff --git a/src/USER-MISC/fix_widom.h b/src/MC/fix_widom.h
similarity index 100%
rename from src/USER-MISC/fix_widom.h
rename to src/MC/fix_widom.h