diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71e3698c..52bc4a03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Added ability Pitman-Yor prior process
+- Users now specify the prior process in the codebook
+- `StateAlpha` and `ViewAlpha` transitions are now `StatePriorProcessParams` and `ViewPriorProcessParams`
 
 ## [python-0.7.1] - 2024-02-27
 
diff --git a/book/src/pcc/img/crp.png b/book/src/pcc/img/crp.png
new file mode 100644
index 00000000..20419171
Binary files /dev/null and b/book/src/pcc/img/crp.png differ
diff --git a/book/src/pcc/img/pyp.png b/book/src/pcc/img/pyp.png
new file mode 100644
index 00000000..74560845
Binary files /dev/null and b/book/src/pcc/img/pyp.png differ
diff --git a/book/src/pcc/prior-processes.md b/book/src/pcc/prior-processes.md
index 8563e4d5..3a6fb8a7 100644
--- a/book/src/pcc/prior-processes.md
+++ b/book/src/pcc/prior-processes.md
@@ -7,6 +7,15 @@ In Lace (and in Bayesian nonparametrics) we put a prior on the number of paramet
 
 The Dirichlet process more heavily penalizes new categories with an exponential fall off while the Pitman-Yor process has a power law fall off in the number for categories. When d = 0, Pitman-Yor is equivalent to the Dirichlet process.
 
-While Pitman-Yor may fit the data better it will create more parameters, which will cause model training to take longer.
+![Dirichlet Process](img/crp.png)
+
+**Figure**: Category ID (y-axis) by instance number (x-axis) for Dirichlet process draws for various values of alpha.
+
+Pitman-Yor may fit the data better but (and because) it will create more parameters, which will cause model training to take longer.
+
+![Pitman-Yor Process](img/pyp.png)
+
+**Figure**: Category ID (y-axis) by instance number (x-axis) for Pitman-Yor process draws for various values of alpha and d.
+
 
 For those looking for a good introduction to prior process, [this slide deck](https://www.gatsby.ucl.ac.uk/~ywteh/teaching/probmodels/lecture5bnp.pdf) from Yee Whye Teh is a good resource.
diff --git a/book/src/workflow/codebook.md b/book/src/workflow/codebook.md
index 98205e0b..2788c219 100644
--- a/book/src/workflow/codebook.md
+++ b/book/src/workflow/codebook.md
@@ -49,7 +49,7 @@ let df = CsvReader::from_path(paths.data)
     .unwrap();
 
 // Create the default codebook
-let codebook = Codebook::from_df(&df, None, None, false).unwrap();
+let codebook = Codebook::from_df(&df, None, None, None, false).unwrap();
 ```
 
 </div>
diff --git a/book/src/workflow/model.md b/book/src/workflow/model.md
index b35d68a3..e13299f5 100644
--- a/book/src/workflow/model.md
+++ b/book/src/workflow/model.md
@@ -125,7 +125,7 @@ let df = CsvReader::from_path(paths.data)
     .unwrap();
 
 // Create the default codebook
-let codebook = Codebook::from_df(&df, None, None, false).unwrap();
+let codebook = Codebook::from_df(&df, None, None, None, false).unwrap();
 
 // Build an rng
 let rng = Xoshiro256Plus::from_entropy();
@@ -156,12 +156,12 @@ let run_config = EngineUpdateConfig::new()
     .n_iters(100)
     .transitions(vec![
         StateTransition::ColumnAssignment(ColAssignAlg::Gibbs),
-        StateTransition::StateAlpha,
+        StateTransition::StatePriorProcessParams,
         StateTransition::RowAssignment(RowAssignAlg::Sams),
         StateTransition::ComponentParams,
         StateTransition::RowAssignment(RowAssignAlg::Slice),
         StateTransition::ComponentParams,
-        StateTransition::ViewAlphas,
+        StateTransition::ViewPriorProcessParams,
         StateTransition::FeaturePriors,
     ]);
 
diff --git a/lace/Cargo.lock b/lace/Cargo.lock
index fcabe039..d9daa165 100644
--- a/lace/Cargo.lock
+++ b/lace/Cargo.lock
@@ -1141,7 +1141,7 @@ dependencies = [
 
 [[package]]
 name = "lace"
-version = "0.7.0"
+version = "0.8.0"
 dependencies = [
  "approx",
  "clap",
diff --git a/lace/Cargo.toml b/lace/Cargo.toml
index 62cd52e0..f5bae231 100644
--- a/lace/Cargo.toml
+++ b/lace/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "lace"
-version = "0.7.0"
+version = "0.8.0"
 authors = ["Promised AI"]
 build = "build.rs"
 edition = "2021"