diff --git a/docs/_config.yml b/docs/_config.yml
index fe85461..58e4adc 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -1,6 +1,7 @@
 # Book settings
 title: Taxcalc-Payroll
 author: Bodi Yang
+logo: ospc-aei.png
 exclude_patterns: [guide/make, guide/templates, recipes/md_src, '**/README.md']
 repository:
   url: https://github.com/bodiyang/Taxcalc-Payroll
diff --git a/docs/_toc.yml b/docs/_toc.yml
index 68b5c4c..2235120 100644
--- a/docs/_toc.yml
+++ b/docs/_toc.yml
@@ -27,11 +27,8 @@ parts:
 - caption: About
   chapters:
   - file: about/history
-  - file: about/roadmap
+  - file: about/model_interaction
   - file: about/releases
-  - file: about/changes
-  - file: about/upgrading
-  - file: about/license
 - caption: Contributing
   chapters:
   - file: contributing/contributor_guide
diff --git a/docs/about/history.md b/docs/about/history.md
index 0bd3f19..d8a8d36 100644
--- a/docs/about/history.md
+++ b/docs/about/history.md
@@ -7,7 +7,7 @@ Taxcalc-Payroll is a payroll tax model, consisted of (1) payroll tax functions
 
 ## Origins of Taxcalc-Payroll
 
-Taxcalc-Payroll orginiats from [Tax-Calculator](https://github.com/PSLmodels/Tax-Calculator). 
+Taxcalc-Payroll orginiates from [Tax-Calculator](https://github.com/PSLmodels/Tax-Calculator). 
 
 In the past, Tax-Calculator was the only microsimulation model for both income tax analysis and payroll tax analysis. 
 
diff --git a/docs/ospc-aei.png b/docs/ospc-aei.png
new file mode 100644
index 0000000..7258af4
Binary files /dev/null and b/docs/ospc-aei.png differ