diff --git a/src/bytes/bytes.go b/src/bytes/bytes.go
index c0cd704180b..5cf5b477ebd 100644
--- a/src/bytes/bytes.go
+++ b/src/bytes/bytes.go
@@ -1329,7 +1329,7 @@ func CutPrefix(s, prefix []byte) (after []byte, found bool) {
 // If suffix is the empty byte slice, CutSuffix returns s, true.
 //
 // CutSuffix returns slices of the original slice s, not copies.
-func CutSuffix(s, suffix []byte) (after []byte, found bool) {
+func CutSuffix(s, suffix []byte) (before []byte, found bool) {
 	if !HasSuffix(s, suffix) {
 		return s, false
 	}
diff --git a/src/strings/strings.go b/src/strings/strings.go
index 7921a20e8ab..1e8de2bc34c 100644
--- a/src/strings/strings.go
+++ b/src/strings/strings.go
@@ -1223,7 +1223,7 @@ func CutPrefix(s, prefix string) (after string, found bool) {
 // and reports whether it found the suffix.
 // If s doesn't end with suffix, CutSuffix returns s, false.
 // If suffix is the empty string, CutSuffix returns s, true.
-func CutSuffix(s, suffix string) (after string, found bool) {
+func CutSuffix(s, suffix string) (before string, found bool) {
 	if !HasSuffix(s, suffix) {
 		return s, false
 	}