diff --git a/parser/parser_test.go b/parser/parser_test.go
index 85c9482..8a80925 100644
--- a/parser/parser_test.go
+++ b/parser/parser_test.go
@@ -1236,7 +1236,7 @@ b: - 2
 		{
 			">\n>",
 			`
-[2:1] could not find multi line content
+[2:1] could not find multi-line content
    1 | >
 >  2 | >
        ^
@@ -1245,7 +1245,7 @@ b: - 2
 		{
 			">\n1",
 			`
-[2:1] could not find multi line content
+[2:1] could not find multi-line content
    1 | >
 >  2 | 1
        ^
@@ -1254,7 +1254,7 @@ b: - 2
 		{
 			"|\n1",
 			`
-[2:1] could not find multi line content
+[2:1] could not find multi-line content
    1 | |
 >  2 | 1
        ^
@@ -1263,7 +1263,7 @@ b: - 2
 		{
 			"a: >3\n  1",
 			`
-[2:3] invalid number of indent is specified in the multi line header
+[2:3] invalid number of indent is specified in the multi-line header
    1 | a: >3
 >  2 |   1
          ^
diff --git a/scanner/context.go b/scanner/context.go
index 06e1fc4..4f3250b 100644
--- a/scanner/context.go
+++ b/scanner/context.go
@@ -168,7 +168,7 @@ func (s *MultiLineState) validateIndentColumn() error {
 		return nil
 	}
 	if s.firstLineIndentColumn > s.lineIndentColumn {
-		return errors.New("invalid number of indent is specified in the multi line header")
+		return errors.New("invalid number of indent is specified in the multi-line header")
 	}
 	return nil
 }
diff --git a/scanner/scanner.go b/scanner/scanner.go
index 96ab0b8..4ef05e3 100644
--- a/scanner/scanner.go
+++ b/scanner/scanner.go
@@ -1282,7 +1282,7 @@ func (s *Scanner) scan(ctx *Context) error {
 					if tk.Position.Column == 1 {
 						return ErrInvalidToken(
 							token.Invalid(
-								"could not find multi line content",
+								"could not find multi-line content",
 								string(ctx.obuf), s.pos(),
 							),
 						)