diff --git a/dvc/command/diff.py b/dvc/command/diff.py
index ca5245d71..a1bcaca34 100644
--- a/dvc/command/diff.py
+++ b/dvc/command/diff.py
@@ -135,7 +135,7 @@ def add_parser(subparsers, parent_parser):
         "--target",
         default=None,
         help=(
-            "Source path to a data file or directory. Default None,"
+            "Source path to a data file or directory. Default None. "
             "If not specified, compares all files and directories "
             "that are under DVC control in the current working space."
         ),
@@ -146,7 +146,7 @@ def add_parser(subparsers, parent_parser):
     diff_parser.add_argument(
         "b_ref",
         help=(
-            "Git reference till which diff calculates, if omitted "
+            "Git reference untill which diff calculates, if omitted "
             "diff shows the difference between current HEAD and a_ref"
         ),
         nargs="?",