diff --git a/dvc/command/data_sync.py b/dvc/command/data_sync.py
index 5b931177e..a6f810c83 100644
--- a/dvc/command/data_sync.py
+++ b/dvc/command/data_sync.py
@@ -97,7 +97,11 @@ def shared_parent_parser():
         "-j",
         "--jobs",
         type=int,
-        help="Number of jobs to run simultaneously.",
+        help=(
+            "Number of jobs to run simultaneously. "
+            "The default value is 4 * cpu_count(). "
+            "For SSH remotes, the default is 4. "
+        ),
         metavar="<number>",
     )
     parent_parser.add_argument(
diff --git a/dvc/command/gc.py b/dvc/command/gc.py
index b1fa32fdb..2948da26b 100644
--- a/dvc/command/gc.py
+++ b/dvc/command/gc.py
@@ -123,7 +123,11 @@ def add_parser(subparsers, parent_parser):
         "-j",
         "--jobs",
         type=int,
-        help="Number of jobs to run simultaneously.",
+        help=(
+            "Number of jobs to run simultaneously. "
+            "The default value is 4 * cpu_count(). "
+            "For SSH remotes, the default is 4. "
+        ),
         metavar="<number>",
     )
     gc_parser.add_argument(