diff --git a/src/seedu/addressbook/AddressBook.java b/src/seedu/addressbook/AddressBook.java
index 5a158b67..3cf72052 100644
--- a/src/seedu/addressbook/AddressBook.java
+++ b/src/seedu/addressbook/AddressBook.java
@@ -1164,4 +1164,14 @@ private static ArrayList<String> splitByWhitespace(String toSplit) {
         return new ArrayList<>(Arrays.asList(toSplit.trim().split("\\s+")));
     }
 
+    /**
+     * Splits a source string into the list of substrings that were separated by string separator.
+     *
+     * @param toSplit source string
+     * @param separator separator string
+     * @return split by separator
+     */
+    private static ArrayList<String> splitBySeparator(String toSplit, String separator) {
+        return new ArrayList<>(Arrays.asList(toSplit.trim().split(separator)));
+    }
 }
\ No newline at end of file