diff --git a/modules/mol/alg/doc/molck.rst b/modules/mol/alg/doc/molck.rst
index 286127b2882447ee370230c2345b013fff8db30a..7c4d9ee6300a7076e32dd9c81161fde444f35d67 100644
--- a/modules/mol/alg/doc/molck.rst
+++ b/modules/mol/alg/doc/molck.rst
@@ -53,7 +53,7 @@ please find them following:
                            - oxt - Remove terminal oxygens
                            - nonstd - Remove all residues not one of the
                                       20 standard amino acids
-                           - unk - Remove unknown and atoms not following
+                           - unk - Remove unknown atoms not following
                                    the nomenclature
                            Default: hyd
       --fix-ele            Clean up element column
diff --git a/tools/molck/main.cc b/tools/molck/main.cc
index 53ff93f4dbe8f10d3782e70ac8842f285c43bee5..efed0e21fc749d05491edb4c74febe05b08f6051 100644
--- a/tools/molck/main.cc
+++ b/tools/molck/main.cc
@@ -38,7 +38,7 @@ const char* USAGE=
 "                       - oxt - Remove terminal oxygens\n"
 "                       - nonstd - Remove all residues not one of the\n"
 "                                  20 standard amino acids\n"
-"                       - unk - Remove unknown and atoms not following\n"
+"                       - unk - Remove unknown atoms not following\n"
 "                               the nomenclature\n"
 "                       Default: hyd\n"
 "  --fix-ele            Clean up element column\n"