diff --git a/README.md b/README.md
index 8654357..bca6048 100644
--- a/README.md
+++ b/README.md
@@ -878,9 +878,14 @@ file_data="$(<"file")"
 Alternative to the `cat` command.
 
 ```shell
-# Bash <4
+# Bash <4 (discarding empty lines).
 IFS=$'\n' read -d "" -ra file_data < "file"
 
+# Bash <4 (preserving empty lines).
+while read -r line; do
+    file_data+=("$line")
+done < "file"
+
 # Bash 4+
 mapfile -t file_data < "file"
 ```
diff --git a/manuscript/chapter4.txt b/manuscript/chapter4.txt
index e7bb50a..902fec6 100644
--- a/manuscript/chapter4.txt
+++ b/manuscript/chapter4.txt
@@ -15,9 +15,14 @@ file_data="$(<"file")"
 Alternative to the `cat` command.
 
 ```shell
-# Bash <4
+# Bash <4 (discarding empty lines).
 IFS=$'\n' read -d "" -ra file_data < "file"
 
+# Bash <4 (preserving empty lines).
+while read -r line; do
+    file_data+=("$line")
+done < "file"
+
 # Bash 4+
 mapfile -t file_data < "file"
 ```