diff --git a/src/doc/trpl/the-stack-and-the-heap.md b/src/doc/trpl/the-stack-and-the-heap.md
index fb778b59a3d93..22c77afa2e592 100644
--- a/src/doc/trpl/the-stack-and-the-heap.md
+++ b/src/doc/trpl/the-stack-and-the-heap.md
@@ -74,7 +74,7 @@ visualize what’s going on with memory. Your operating system presents a view o
 memory to your program that’s pretty simple: a huge list of addresses, from 0
 to a large number, representing how much RAM your computer has. For example, if
 you have a gigabyte of RAM, your addresses go from `0` to `1,073,741,823`. That
-number comes from 2<sup>30</sup>, the number of bytes in a gigabyte.
+number comes from 2<sup>30</sup> - 1, the number of bytes in a gigabyte.
 
 This memory is kind of like a giant array: addresses start at zero and go
 up to the final number. So here’s a diagram of our first stack frame: