diff --git a/src/runtime/utf8.go b/src/runtime/utf8.go
index 6bf596581d..52b757662d 100644
--- a/src/runtime/utf8.go
+++ b/src/runtime/utf8.go
@@ -7,7 +7,7 @@ package runtime
 // Numbers fundamental to the encoding.
 const (
 	runeError = '\uFFFD'     // the "error" Rune or "Unicode replacement character"
-	runeSelf  = 0x80         // characters below Runeself are represented as themselves in a single byte.
+	runeSelf  = 0x80         // characters below runeSelf are represented as themselves in a single byte.
 	maxRune   = '\U0010FFFF' // Maximum valid Unicode code point.
 )
 
diff --git a/src/unicode/utf8/utf8.go b/src/unicode/utf8/utf8.go
index b722a03923..b8368fce41 100644
--- a/src/unicode/utf8/utf8.go
+++ b/src/unicode/utf8/utf8.go
@@ -14,7 +14,7 @@ package utf8
 // Numbers fundamental to the encoding.
 const (
 	RuneError = '\uFFFD'     // the "error" Rune or "Unicode replacement character"
-	RuneSelf  = 0x80         // characters below Runeself are represented as themselves in a single byte.
+	RuneSelf  = 0x80         // characters below RuneSelf are represented as themselves in a single byte.
 	MaxRune   = '\U0010FFFF' // Maximum valid Unicode code point.
 	UTFMax    = 4            // maximum number of bytes of a UTF-8 encoded Unicode character.
 )