diff --git a/book/src/concepts/arithmetization.md b/book/src/concepts/arithmetization.md
index 181f4682..65b25c82 100644
--- a/book/src/concepts/arithmetization.md
+++ b/book/src/concepts/arithmetization.md
@@ -19,13 +19,13 @@ A PLONKish circuit depends on a ***configuration***:
* A subset of the columns that can participate in equality constraints.
-* A ***polynomial degree bound***.
+* A ***maximum constraint degree***.
* A sequence of ***polynomial constraints***. These are multivariate polynomials over
$\mathbb{F}$ that must evaluate to zero *for each row*. The variables in a polynomial
constraint may refer to a cell in a given column of the current row, or a given column of
another row relative to this one (with wrap-around, i.e. taken modulo $n$). The maximum
- degree of each polynomial is given by the polynomial degree bound.
+ degree of each polynomial is given by the maximum constraint degree.
* A sequence of ***lookup arguments*** defined over tuples of ***input expressions***
(which are multivariate polynomials as above) and ***table columns***.
diff --git a/book/src/design/proving-system/circuit-commitments.md b/book/src/design/proving-system/circuit-commitments.md
index 2c5d4abd..73527889 100644
--- a/book/src/design/proving-system/circuit-commitments.md
+++ b/book/src/design/proving-system/circuit-commitments.md
@@ -61,7 +61,7 @@ Let $c$ be the number of columns that are enabled for equality constraints.
Let $m$ be the maximum number of columns that can accommodated by a
[column set](permutation.md#spanning-a-large-number-of-columns) without exceeding
-the PLONK configuration's polynomial degree bound.
+the PLONK configuration's maximum constraint degree.
Let $u$ be the number of “usable” rows as defined in the
[Permutation argument](permutation.md#zero-knowledge-adjustment) section.
diff --git a/book/src/design/proving-system/permutation-diagram.png b/book/src/design/proving-system/permutation-diagram.png
index 42e23567..a0f683a9 100644
Binary files a/book/src/design/proving-system/permutation-diagram.png and b/book/src/design/proving-system/permutation-diagram.png differ
diff --git a/book/src/design/proving-system/permutation-diagram.svg b/book/src/design/proving-system/permutation-diagram.svg
index 5ef82622..2ae7f314 100644
--- a/book/src/design/proving-system/permutation-diagram.svg
+++ b/book/src/design/proving-system/permutation-diagram.svg
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