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diff --git a/README.md b/README.md
index e2923fb5..a00b4a90 100644
--- a/README.md
+++ b/README.md
@@ -65,3 +65,5 @@ The Simple language is styled after a subset of C or Java.
 * [Chapter 19](chapter19/README.md): Instruction selection and portable compilation
 * [Chapter 20](chapter20/README.md): Graph Coloring Register Allocation
 * [Chapter 21](chapter21/README.md): Instruction Encodings & ELF
+* [Chapter 22](chapter22/README.md): Strings And I/O
+