diff --git a/doc/webp-lossless-bitstream-spec.txt b/doc/webp-lossless-bitstream-spec.txt
index e6732636..9f013724 100644
--- a/doc/webp-lossless-bitstream-spec.txt
+++ b/doc/webp-lossless-bitstream-spec.txt
@@ -436,7 +436,7 @@ int8 ColorTransformDelta(int8 t, int8 c) {
 A conversion from the 8-bit unsigned representation (uint8) to the 8-bit
 signed one (int8) is required before calling `ColorTransformDelta()`.
 It should be performed using 8-bit two's complement (that is: uint8 range
-\[128-255\] is mapped to the \[-128, -1\] range of its converted int8 value).
+\[128..255\] is mapped to the \[-128..-1\] range of its converted int8 value).
 
 The multiplication is to be done using more precision (with at least
 16-bit dynamics). The sign extension property of the shift operation