* docs/formats.txt: Give pointer to PCF documentation. Information provided by Alan Coopersmith <alan.coopersmith@oracle.com>.
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diff --git a/ChangeLog b/ChangeLog
index 0a0f4ec..6b96017 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-05-11 Werner Lemberg <wl@gnu.org>
+
+ * docs/formats.txt: Give pointer to PCF documentation.
+ Information provided by Alan Coopersmith
+ <alan.coopersmith@oracle.com>.
+
2010-05-10 Ken Sharp <ken.sharp@artifex.com>
Fix Savannah bug #29846.
diff --git a/docs/formats.txt b/docs/formats.txt
index c64d6d0..efec660 100644
--- a/docs/formats.txt
+++ b/docs/formats.txt
@@ -143,9 +143,17 @@ MAC --- PS TYPE_1 --- type1 T1_SPEC.pdf
[3] Support is rudimentary currently; some tables are not loaded yet.
-[4] There is no formal PCF specification; you have to deduce the exact
- format from the source code within X11. George Williams did this for
- his FontForge editor:
+[4] See
+
+ THE X WINDOW SYSTEM SERVER: X VERSION 11, RELEASE 5
+ Elias Israel, Erik Fortune, Digital Press, 1992
+ ISBN 1-55558-096-3
+
+ for a specification given in Appendix D on pgs. 436-450. However,
+ this information might be out of date; unfortunately, there is no
+ PCF specification available online, and this book is out of print.
+ George Williams deduced the font format from the X11 sources and
+ documented it for his FontForge font editor:
http://fontforge.sourceforge.net/pcf-format.html