diff --git a/docs/errata/README.md b/docs/errata/README.md
index c5722d1..dd84301 100644
--- a/docs/errata/README.md
+++ b/docs/errata/README.md
@@ -2,7 +2,7 @@
 
 If you find any mistakes in the seventh edition, *C# 11 and .NET 7 - Modern Cross-Platform Development Fundamentals*, or if you have suggestions for improvements, then please [raise an issue in this repository](https://github.com/markjprice/cs11dotnet7/issues) or email me at markjprice (at) gmail.com.
 
-[**Errata** (18 items)](errata.md): Typos, tool user interface changes, or mistakes in code that would cause a compilation error that prevents a successful build.
+[**Errata** (19 items)](errata.md): Typos, tool user interface changes, or mistakes in code that would cause a compilation error that prevents a successful build.
 
 [**Improvements** (3 items)](improvements.md): Changes to text or code that would improve the content. These are optional.
 
diff --git a/docs/errata/errata.md b/docs/errata/errata.md
index 4b57f68..b39601e 100644
--- a/docs/errata/errata.md
+++ b/docs/errata/errata.md
@@ -1,4 +1,4 @@
-**Errata** (18 items)
+**Errata** (19 items)
 
 If you find any mistakes, then please [raise an issue in this repository](https://github.com/markjprice/cs11dotnet7/issues) or email me at markjprice (at) gmail.com.
 
@@ -8,6 +8,7 @@ If you find any mistakes, then please [raise an issue in this repository](https:
 - [Page 11 - Understanding the journey to one .NET and Understanding .NET support](#page-11---understanding-the-journey-to-one-net-and-understanding-net-support)
 - [Page 37 - Getting definitions of types and their members](#page-37---getting-definitions-of-types-and-their-members)
 - [Page 83 - Formatting using numbered positional arguments](#page-83---formatting-using-numbered-positional-arguments)
+- [Page 83 - Formatting using interpolated strings](#page-83---formatting-using-interpolated-strings)
 - [Page 85 - Getting text input from the user](#page-85---getting-text-input-from-the-user)
 - [Page 86 - Getting text input from the user](#page-86---getting-text-input-from-the-user)
 - [Page 185 - Creating a class library that needs testing](#page-185---creating-a-class-library-that-needs-testing)
@@ -87,6 +88,22 @@ Console.WriteLine(
  "Roger", "Cevung", "Stockholm", "Education", "Optimizely");
 ```
 
+# Page 83 - Formatting using interpolated strings
+
+In Step 1, you enter some statements to output some variables using an interpolated string, as shown in the following code:
+```cs
+// The following statement must be all on one line.
+Console.WriteLine($"{numberOfApples} apples cost {pricePerApple * numberOfApples:C}");
+```
+
+The comment says that it "must be all on one line". This is true for C# 10 and earlier (which is the default compiler if you target .NET 6), but if you use C# 11 then an expression inside an interpolation hole like `{pricePerApple * numberOfApples:C}` can now include line breaks. So we can, for example, enter the statement like this:
+```cs
+// The following statement must be all on one line when using C# 10 or earlier.
+// If using C# 11, we can include a line break, as shown here:
+Console.WriteLine($"{numberOfApples} apples cost {pricePerApple 
+  * numberOfApples:C}");
+```
+
 # Page 85 - Getting text input from the user
 
 I wrote that a notebook "does not support reading input from the console using `Console.ReadLine()`." Although this is true, you can use the `Microsoft.DotNet.Interactive.Kernel` class and its `GetInputAsync` method instead. This uses the .NET Interactive integration with the Visual Studio Code user interface to prompt the user for input.