diff --git a/.github/workflows/cmake-sm1000.yml b/.github/workflows/cmake-sm1000.yml
index cce1bbe2..ab24b5d2 100644
--- a/.github/workflows/cmake-sm1000.yml
+++ b/.github/workflows/cmake-sm1000.yml
@@ -12,7 +12,7 @@ jobs:
     # well on Windows or Mac.  You can convert this to a matrix build if you need
     # cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index df02ee22..8550384c 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -12,7 +12,7 @@ jobs:
     # well on Windows or Mac.  You can convert this to a matrix build if you need
     # cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v2
diff --git a/doc/codec2.pdf b/doc/codec2.pdf
index 6e63266a..c47e5f80 100644
Binary files a/doc/codec2.pdf and b/doc/codec2.pdf differ
diff --git a/doc/codec2.tex b/doc/codec2.tex
index b9dd0e47..9bcd3106 100644
--- a/doc/codec2.tex
+++ b/doc/codec2.tex
@@ -19,7 +19,8 @@
   \input{gitbranch.txt}
 }
 
-\title{Codec 2}
+\title{Codec 2 Algorithm Description}
+
 \author{David Rowe\\ \\ Revision: {\gitrevision} on branch: {\branch}}
 
 \begin{document}