diff --git a/interpreter/function/builtin/digest_base64_decode.go b/interpreter/function/builtin/digest_base64_decode.go
index a7c88621..fc013ab1 100644
--- a/interpreter/function/builtin/digest_base64_decode.go
+++ b/interpreter/function/builtin/digest_base64_decode.go
@@ -87,10 +87,9 @@ func Digest_base64_decode_removeInvalidCharacters(input string) string {
 		case b == 0x3D: // =
 			// If "=" sign found, next byte must also be "="
 			if peek, err := r.Peek(1); err != nil && peek[0] == 0x3D {
-				// If removed bytes is not multiple of 4bytes, the sign is padding
 				removed.WriteByte(b)
 				removed.WriteByte(b)
-				r.ReadByte() // skip next equal sign
+				r.ReadByte() // skip next "=" character
 				continue
 			}
 			// Otherwise, treat as invalid character, stop decoding
diff --git a/interpreter/function/builtin/digest_base64url_decode.go b/interpreter/function/builtin/digest_base64url_decode.go
index ee7a79d5..8cc601d9 100644
--- a/interpreter/function/builtin/digest_base64url_decode.go
+++ b/interpreter/function/builtin/digest_base64url_decode.go
@@ -72,10 +72,9 @@ func Digest_base64url_decode_removeInvalidCharacters(input string) string {
 		case b == 0x3D: // =
 			// If "=" sign found, next byte must also be "="
 			if peek, err := r.Peek(1); err != nil && peek[0] == 0x3D {
-				// If removed bytes is not multiple of 4bytes, the sign is padding
 				removed.WriteByte(b)
 				removed.WriteByte(b)
-				r.ReadByte() // skip next equal sign
+				r.ReadByte() // skip next "=" character
 				continue
 			}
 			// Otherwise, treat as invalid character, stop decoding