diff --git usr.bin/mg/mg.1 usr.bin/mg/mg.1
index 96bc62ae8f8..a20b026a32c 100644
--- usr.bin/mg/mg.1
+++ usr.bin/mg/mg.1
@@ -496,8 +496,8 @@ Delete trailing whitespace on the current line.
Delete all lines after dot that contain a string matching
the supplied regular expression.
.It delete-non-matching-lines
-Delete all lines after dot that contain a string matching
-the supplied regular expression.
+Delete all lines after dot that don't contain a string
+matching the supplied regular expression.
.It delete-other-windows
Make the current window the only window visible on the screen.
.It delete-window
