diff --git a/tex/text.tex b/tex/text.tex
index 89dde27..4e16487 100644
--- a/tex/text.tex
+++ b/tex/text.tex
@@ -101,7 +101,7 @@ distributed to the other party via untrusted channels. In 1976 Whitfield Diffie
 and Martin Hellman published a paper in which they devised a \emph{public-key
 distribution scheme}, which allows the two parties to arrive at a shared secret
 by exchanging information via insecure channels with the presence of an
-eavesdropper.
+eavesdropper. This scheme (or its variations) is in use to this day.
 
 \n{2}{Hash functions}
 
@@ -117,11 +117,12 @@ device has come across, such as when connecting to a website protected by the
 famed HTTPS.
 
 The popularity stems from a common use case: the need to identify a chunk of
-data. Of course, two chunks of data, two files, frames or packets could
-always be compared bit by bit, but that can get prohibitive from both cost and
-energy point of view relatively quickly. That is when hash functions come in,
+data. Of course, two chunks of data, two files, frames or packets could always
+be compared bit by bit, but that can get prohibitive from both cost and energy
+point of view relatively quickly. That is when the hash functions come in,
 since they are able to take a long input and produce a short output, named a
-digest or a hash value.
+digest or a hash value. It also does not work the other way around, a file
+cannot be reconstructed from the hash digest, it is a one-way function.
 
 \n{3}{Rainbow tables}