doc-src/ERRATA.txt

--- a/doc-src/ERRATA.txt	Mon Jul 18 12:22:30 1994 +0200
+++ b/doc-src/ERRATA.txt	Mon Jul 18 12:24:35 1994 +0200
@@ -26,3 +26,5 @@
 
 Ref/defining: type constraints ("::") now have a very low priority of 4.
               As in ML, they must be enclosed in paretheses most of the time.
+
+Ref/theories: added init_thy_reader and removed extend_theory.