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diff --git a/Doc/lib/libascii.tex b/Doc/lib/libascii.tex
index f3a1655..ae4fe6f 100644
--- a/Doc/lib/libascii.tex
+++ b/Doc/lib/libascii.tex
@@ -53,7 +53,9 @@ control characters as follows:
\lineii{DEL}{Delete}
\end{tableii}
-Note that many of these have little practical use in modern usage.
+Note that many of these have little practical significance in modern
+usage. The mnemonics derive from teleprinter conventions that predate
+digital computers.
The module supplies the following functions, patterned on those in the
standard C library: