Feeble attempt to repair obsolete info about hex escapes.
diff --git a/Doc/ref/ref2.tex b/Doc/ref/ref2.tex
index d1503b4..3a8bba2 100644
--- a/Doc/ref/ref2.tex
+++ b/Doc/ref/ref2.tex
@@ -358,10 +358,8 @@
\end{tableii}
\index{ASCII@\ASCII{}}
-In strict compatibility with Standard C, up to three octal digits are
-accepted, but an unlimited number of hex digits is taken to be part of
-the hex escape (and then the lower 8 bits of the resulting hex number
-are used in 8-bit implementations).
+As in Standard C, up to three octal digits are accepted. However,
+exactly two hex digits are taken in hex escapes.
Unlike Standard \index{unrecognized escape sequence}C,
all unrecognized escape sequences are left in the string unchanged,