diff --git a/manimlib/config.py b/manimlib/config.py
index fef3d409..ed5da5a9 100644
--- a/manimlib/config.py
+++ b/manimlib/config.py
@@ -117,7 +117,7 @@ def parse_cli():
                  "the rendering at the second value",
         )
         parser.add_argument(
-            "-e", "--embed",
+            "-e", "--embed", metavar="LINENO",
             help="Takes a line number as an argument, and results"
                  "in the scene being called as if the line `self.embed()`"
                  "was inserted into the scene code at that line number."