diff --git a/src/main/kotlin/Word.kt b/src/main/kotlin/Word.kt
index b907abe..2b7bb1d 100644
--- a/src/main/kotlin/Word.kt
+++ b/src/main/kotlin/Word.kt
@@ -23,6 +23,11 @@ class Word(val parts: Sequence<String>) {
 	 */
 	fun toNotation(notation: StringNotation) = notation.print(this)
 
+	/**
+	 * Creates a new word, with all its parts transformed by the provided [transform] function.
+	 */
+	fun mapParts(transform: (String) -> String) = Word(parts.map(transform))
+
 	/**
 	 * Appends a part to this word.
 	 */
diff --git a/src/test/kotlin/WordTest.kt b/src/test/kotlin/WordTest.kt
index 99842e3..be1d88b 100644
--- a/src/test/kotlin/WordTest.kt
+++ b/src/test/kotlin/WordTest.kt
@@ -23,6 +23,23 @@ class WordTest {
 
 	@Test
 	fun `allows to add parts`() {
-		expect((Word("with") + "more" + "parts")).feature(Word::partsList).containsExactly("with", "more", "parts")
+		expect((Word("with") + "more" + "parts"))
+			.feature(Word::partsList)
+			.containsExactly("with", "more", "parts")
+	}
+
+	@Test
+	fun `allows to add words`() {
+		expect(Word("with") + Word("more", "parts"))
+			.feature(Word::partsList)
+			.containsExactly("with", "more", "parts")
+	}
+
+	@Test
+	fun `allows to transform parts`() {
+		expect(Word("a", "b", "c"))
+			.feature(Word::mapParts, String::toUpperCase)
+			.feature(Word::partsList)
+			.containsExactly("A", "B", "C");
 	}
 }