diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 4f1c7329..53e75fc0 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -59,7 +59,7 @@
 - [Parallel Compilation](./parallel-rustc.md)
 - [Rustdoc](./rustdoc-internals.md)
 
-# Source Code Representations
+# Source Code Representation
 
 - [Prologue](./part-3-intro.md)
 - [Command-line arguments](./cli.md)
diff --git a/src/part-3-intro.md b/src/part-3-intro.md
index 2af8cce2..c1008063 100644
--- a/src/part-3-intro.md
+++ b/src/part-3-intro.md
@@ -1,4 +1,4 @@
-# Part 3: Source Code Representations
+# Part 3: Source Code Representation
 
 This part describes the process of taking raw source code from the user and
 transforming it into various forms that the compiler can work with easily.