diff --git a/python/obitools3/apps/optiongroups/__init__.py b/python/obitools3/apps/optiongroups/__init__.py
index 2e4cf69..013ca8c 100755
--- a/python/obitools3/apps/optiongroups/__init__.py
+++ b/python/obitools3/apps/optiongroups/__init__.py
@@ -222,7 +222,7 @@ def __addDMSOutputOption(optionManager):
     group.add_argument('--no-create-dms',
                  action="store_true", dest="obi:nocreatedms",
                  default=False,
-                 help="Don't create an output DMS it does not already exist")
+                 help="Don't create an output DMS if it does not already exist")
 
 
 def __addEltLimitOption(optionManager):
diff --git a/python/obitools3/commands/grep.pyx b/python/obitools3/commands/grep.pyx
index 5389c01..ab366c7 100644
--- a/python/obitools3/commands/grep.pyx
+++ b/python/obitools3/commands/grep.pyx
@@ -36,14 +36,13 @@ def addOptions(parser):
                        metavar="<PREDICATE>",
                        default=[],
                        type=str,
-                       help="Warning: use bytes for character strings (b'text' instead of 'text'). "
-                            "Python boolean expression to be evaluated in the "
+                       help="Python boolean expression to be evaluated in the "
                             "sequence/line context. The attribute name can be "
                             "used in the expression as a variable name. "
                             "An extra variable named 'sequence' or 'line' refers "
                             "to the sequence or line object itself. "
                             "Several -p options can be used on the same "
-                            "commande line.")
+                            "command line.")
  
     group.add_argument("-S", "--sequence",
                        action="store", dest="grep:seq_pattern",