Add .sfd format documentation link
Change-Id: I76f75d17064f16ade39fcfe31d862dfbe9cf97d7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106132
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
diff --git a/extras/source/truetype/symbol/README b/extras/source/truetype/symbol/README
index c87aca9..40ca074 100644
--- a/extras/source/truetype/symbol/README
+++ b/extras/source/truetype/symbol/README
@@ -1,5 +1,6 @@
Modify the OpenSymbol.sfd and generate opens___.ttf from it with FontForge. The
.sfd is the canonical source for the .ttf.
.sfd is the canonical source for the .ttf. See .sfd format documentation at
https://fontforge.org/docs/techref/sfdformat.html.
Use TTX/FontTools, which can dump the content of .ttf as an XML file, in order
to make sure that the resulting .ttf differs only deliberately from the original
one.
