diff --git a/src/encoding/base32/base32.go b/src/encoding/base32/base32.go
index 66f24e98a6..8bda6c6799 100644
--- a/src/encoding/base32/base32.go
+++ b/src/encoding/base32/base32.go
@@ -401,6 +401,7 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 // AppendDecode appends the base32 decoded src to dst
 // and returns the extended buffer.
 // If the input is malformed, it returns the partially decoded src and an error.
+// New line characters (\r and \n) are ignored.
 func (enc *Encoding) AppendDecode(dst, src []byte) ([]byte, error) {
 	// Compute the output size without padding to avoid over allocating.
 	n := len(src)
@@ -415,6 +416,8 @@ func (enc *Encoding) AppendDecode(dst, src []byte) ([]byte, error) {
 }
 
 // DecodeString returns the bytes represented by the base32 string s.
+// If the input is malformed, it returns the partially decoded data and
+// [CorruptInputError]. New line characters (\r and \n) are ignored.
 func (enc *Encoding) DecodeString(s string) ([]byte, error) {
 	buf := []byte(s)
 	l := stripNewlines(buf, buf)
diff --git a/src/encoding/base64/base64.go b/src/encoding/base64/base64.go
index 7f0fa2de78..f94bea132c 100644
--- a/src/encoding/base64/base64.go
+++ b/src/encoding/base64/base64.go
@@ -409,6 +409,7 @@ func (enc *Encoding) decodeQuantum(dst, src []byte, si int) (nsi, n int, err err
 // AppendDecode appends the base64 decoded src to dst
 // and returns the extended buffer.
 // If the input is malformed, it returns the partially decoded src and an error.
+// New line characters (\r and \n) are ignored.
 func (enc *Encoding) AppendDecode(dst, src []byte) ([]byte, error) {
 	// Compute the output size without padding to avoid over allocating.
 	n := len(src)
@@ -423,6 +424,8 @@ func (enc *Encoding) AppendDecode(dst, src []byte) ([]byte, error) {
 }
 
 // DecodeString returns the bytes represented by the base64 string s.
+// If the input is malformed, it returns the partially decoded data and
+// [CorruptInputError]. New line characters (\r and \n) are ignored.
 func (enc *Encoding) DecodeString(s string) ([]byte, error) {
 	dbuf := make([]byte, enc.DecodedLen(len(s)))
 	n, err := enc.Decode(dbuf, []byte(s))