diff --git a/docs/usermanual-clusters.xml b/docs/usermanual-clusters.xml index a7b16580a..9147ff0a5 100644 --- a/docs/usermanual-clusters.xml +++ b/docs/usermanual-clusters.xml @@ -156,14 +156,16 @@ order. </para> <para> - For left-to-right scripts (LTR) and top-to-bottom scripts (TTB), + For buffers in the left-to-right (LTR) + or top-to-bottom (TTB) text flow direction, HarfBuzz will preserve the monotonic property: client programs are guaranteed that monotonically increasing initial cluster values will be returned as monotonically increasing final cluster values. </para> <para> - For right-to-left scripts (RTL) and bottom-to-top scripts (BTT), + For buffers in the right-to-left (RTL) + or bottom-to-top (BTT) text flow direction, the directionality of the buffer itself is reversed for final output as a matter of design. Therefore, HarfBuzz inverts the monotonic property: client programs are guaranteed that