diff --git a/ch08_signatures.adoc b/ch08_signatures.adoc
index 48d3082f..a312eda3 100644
--- a/ch08_signatures.adoc
+++ b/ch08_signatures.adoc
@@ -302,17 +302,17 @@ Provable security::
   computers).
 
 Linearity::
-  Schnorr signatures have a property that mathematicians call
+  Schnorr signatures have a property that mathematicians ((("linearity")))call
   _linearity_, which applies to functions with two particular
   properties.  The first property is that summing together two or more
   variables and then running a function on that sum will produce the
   same value as running the function on each of the variables
   independently and then summing together the results, e.g.,
-  +f(x + y + z) == f(x) + f(y) + f(z)+; this property is called
+  +f(x + y + z) == f(x) + f(y) + f(z)+; this property is((("additivity"))) called
   _additivity_.  The second property is that multiplying a variable and
   then running a function on that product will produce the same value as
   running the function on the variable and then multiplying it by the
-  same amount, e.g., +f(a * x) == a * f(x)+; this property is called
+  same amount, e.g., +f(a * x) == a * f(x)+; this property is ((("homogeneity of degree 1")))called
   _homogeneity of degree 1_.
 +
 In cryptographic operations, some functions may be private (such