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-rw-r--r--extras/source/truetype/symbol/README3
1 files changed, 2 insertions, 1 deletions
diff --git a/extras/source/truetype/symbol/README b/extras/source/truetype/symbol/README
index c87aca945e13..40ca0748fc8e 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.