diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index ab65443b32..f234b2e4d2 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -43,4 +43,5 @@
   - [Polynomials](background/polynomials.md)
   - [Cryptographic groups](background/groups.md)
   - [Elliptic curves](background/curves.md)
+  - [Polynomial commitment using inner product argument](background/pc-ipa.md)
   - [Recursion](background/recursion.md)
diff --git a/book/src/design/proving-system/inner-product.md b/book/src/design/proving-system/inner-product.md
index 41c4f440b7..7ccc9b2fbf 100644
--- a/book/src/design/proving-system/inner-product.md
+++ b/book/src/design/proving-system/inner-product.md
@@ -3,6 +3,8 @@
 Halo 2 uses a polynomial commitment scheme for which we can create polynomial commitment
 opening proofs, based around the Inner Product Argument.
 
+> TODO: Explain Halo 2's variant of the IPA.
+>
 > It is very similar to $\text{PC}_\text{DL}.\text{Open}$ from Appendix A.2 of [BCMS20].
 > See [this comparison](comparison.md#bcms20-appendix-a2) for details.
 >
diff --git a/book/src/user/experimental-features.md b/book/src/user/experimental-features.md
index 9196501814..b64b9cbc2c 100644
--- a/book/src/user/experimental-features.md
+++ b/book/src/user/experimental-features.md
@@ -4,7 +4,11 @@ In `privacy-scaling-explorations/halo2` fork we have implemented many experiment
 
 ## Commitment scheme abstraction
 
-To support different kinds of polynomial commitment schemes, we've added a trait `CommitmentScheme` to allow create/verify proofs with different commitment scheme implementations, currently there are one available implementations in this fork:
+To support different kinds of polynomial commitment schemes, we've added a trait `CommitmentScheme` to allow create/verify proofs with different commitment scheme implementations, currently there are 2 available implementations in this fork:
+
+- [`IPACommitmentScheme`](https://privacy-scaling-explorations.github.io/halo2/halo2_proofs/poly/ipa/commitment/struct.IPACommitmentScheme.html)
+
+  The original implementation from `zcash/halo2` with the original multi-open strategy `{Prover,Verifier}IPA`
 
 - [`KZGCommitmentScheme`](https://privacy-scaling-explorations.github.io/halo2/halo2_proofs/poly/kzg/commitment/struct.KZGCommitmentScheme.html)
 
@@ -16,6 +20,10 @@ To support different kinds of polynomial commitment schemes, we've added a trait
 When using `create_proof` and `verify_proof`, we need to specify the commitment scheme and multi-open strategy like:
 
 ```rust
+// Using IPA
+create_proof<IPACommitmentScheme<_>, ProverIPA<_>, _, _, _, _>
+verify_proof<IPACommitmentScheme<_>, ProverIPA<_>, _, _, _>
+
 // Using KZG with GWC19 multi-open strategy
 create_proof<KZGCommitmentScheme<_>, ProverGWC<_>, _, _, _, _>
 verify_proof<KZGCommitmentScheme<_>, ProverGWC<_>, _, _, _>