diff --git a/doc/03.rawInputAndOutput.md b/doc/03.rawInputAndOutput.md
index a64af85..807f541 100644
--- a/doc/03.rawInputAndOutput.md
+++ b/doc/03.rawInputAndOutput.md
@@ -557,9 +557,10 @@ Now let's implement the Home and End keys. Like the
previous keys, these keys also send escape sequences. Unlike the previous keys,
there are many different escape sequences that could be sent by these keys,
depending on your OS, or your terminal emulator. The Home key could
-be sent as `[1~`, `[7~`, `[H`, or `OH`. Similarly, the
-End key could be sent as `[4~`, `[8~`, `[F`, or
-`OF`. Let's handle all of these cases.
+be sent as `[1~`, `[7~`, `[H`, or `OH` (this is the letter O
+followed by H). Similarly, the End key could be sent as `[4~`,
+`[8~`, `[F`, or `OF` (this is the letter O followed by F). Let's
+handle all of these cases.
{{detect-home-end}}