diff --git a/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java b/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java
index ec6e3f6..12015de 100644
--- a/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java
+++ b/src/main/java/com/example/jerseyexercise/resources/SYamagiwa.java
@@ -86,12 +86,22 @@
         return lastName;
     }
 
+    /**
+     * Update the first name of the account.
+     *
+     * @param firstName The first name of the account.
+     */
     @PUT
     @Path("/firstName")
     public void setFirstName(@FormParam("firstName") String firstName) {
         this.firstName = firstName;
     }
 
+    /**
+     * Update the last name of the account.
+     *
+     * @param lastName The last name of the account.
+     */
     @PUT
     @Path("/lastName")
     public void setLastName(@FormParam("lastName") String lastName) {