diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index f394608b42..0378cd574e 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -286,10 +286,11 @@ zebra::
 	are painted using either the 'color.diff.{old,new}Moved' color or
 	'color.diff.{old,new}MovedAlternative'. The change between
 	the two colors indicates that a new block was detected.
-dimmed_zebra::
+dimmed-zebra::
 	Similar to 'zebra', but additional dimming of uninteresting parts
 	of moved code is performed. The bordering lines of two adjacent
 	blocks are considered interesting, the rest is uninteresting.
+	`dimmed_zebra` is a deprecated synonym.
 --
 
 --color-moved-ws=<modes>::
diff --git a/diff.c b/diff.c
index 04d044bbb6..0746d59fe6 100644
--- a/diff.c
+++ b/diff.c
@@ -271,10 +271,12 @@ static int parse_color_moved(const char *arg)
 		return COLOR_MOVED_ZEBRA;
 	else if (!strcmp(arg, "default"))
 		return COLOR_MOVED_DEFAULT;
+	else if (!strcmp(arg, "dimmed-zebra"))
+		return COLOR_MOVED_ZEBRA_DIM;
 	else if (!strcmp(arg, "dimmed_zebra"))
 		return COLOR_MOVED_ZEBRA_DIM;
 	else
-		return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed_zebra', 'plain'"));
+		return error(_("color moved setting must be one of 'no', 'default', 'blocks', 'zebra', 'dimmed-zebra', 'plain'"));
 }
 
 static int parse_color_moved_ws(const char *arg)
diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 41facf7abf..e2dc1895ba 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -1305,7 +1305,7 @@ test_expect_success 'detect blocks of moved code' '
 
 '
 
-test_expect_success 'detect permutations inside moved code -- dimmed_zebra' '
+test_expect_success 'detect permutations inside moved code -- dimmed-zebra' '
 	# reuse setup from test before!
 	test_config color.diff.oldMoved "magenta" &&
 	test_config color.diff.newMoved "cyan" &&
@@ -1315,7 +1315,7 @@ test_expect_success 'detect permutations inside moved code -- dimmed_zebra' '
 	test_config color.diff.newMovedDimmed "normal cyan" &&
 	test_config color.diff.oldMovedAlternativeDimmed "normal blue" &&
 	test_config color.diff.newMovedAlternativeDimmed "normal yellow" &&
-	git diff HEAD --no-renames --color-moved=dimmed_zebra --color >actual.raw &&
+	git diff HEAD --no-renames --color-moved=dimmed-zebra --color >actual.raw &&
 	grep -v "index" actual.raw | test_decode_color >actual &&
 	cat <<-\EOF >expected &&
 	<BOLD>diff --git a/lines.txt b/lines.txt<RESET>