diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/AcmeClient.java b/acme4j-client/src/main/java/org/shredzone/acme4j/AcmeClient.java
index 6b8a8dad..135d76c3 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/AcmeClient.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/AcmeClient.java
@@ -39,7 +39,7 @@ public interface AcmeClient {
     void newRegistration(Account account, Registration registration) throws AcmeException;
 
     /**
-     * Updates an existing account.
+     * Modifies an existing account.
      *
      * @param account
      *            {@link Account} that is registered
@@ -47,7 +47,7 @@ public interface AcmeClient {
      *            {@link Registration} containing updated registration data. Set the
      *            account location via {@link Registration#setLocation(URI)}!
      */
-    void updateRegistration(Account account, Registration registration) throws AcmeException;
+    void modifyRegistration(Account account, Registration registration) throws AcmeException;
 
     /**
      * Creates a new {@link Authorization} for a domain.
@@ -79,7 +79,7 @@ public interface AcmeClient {
     void updateChallenge(Challenge challenge) throws AcmeException;
 
     /**
-     * Restore a {@link Challenge} instance if only the challenge URI is known. It
+     * Restores a {@link Challenge} instance if only the challenge URI is known. It
      * contains the current state.
      *
      * @param challengeUri
@@ -90,7 +90,7 @@ public interface AcmeClient {
     <T extends Challenge> T restoreChallenge(URI challengeUri) throws AcmeException;
 
     /**
-     * Request a certificate.
+     * Requests a certificate.
      *
      * @param account
      *            {@link Account} to be used for conversation
diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/impl/AbstractAcmeClient.java b/acme4j-client/src/main/java/org/shredzone/acme4j/impl/AbstractAcmeClient.java
index a98d5812..9b6cf648 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/impl/AbstractAcmeClient.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/impl/AbstractAcmeClient.java
@@ -125,7 +125,7 @@ public abstract class AbstractAcmeClient implements AcmeClient {
     }
 
     @Override
-    public void updateRegistration(Account account, Registration registration) throws AcmeException {
+    public void modifyRegistration(Account account, Registration registration) throws AcmeException {
         if (account == null) {
             throw new NullPointerException("account must not be null");
         }
@@ -136,7 +136,7 @@ public abstract class AbstractAcmeClient implements AcmeClient {
             throw new IllegalArgumentException("registration location must not be null. Use newRegistration() if not known.");
         }
 
-        LOG.debug("updateRegistration");
+        LOG.debug("modifyRegistration");
         try (Connection conn = createConnection()) {
             ClaimBuilder claims = new ClaimBuilder();
             claims.putResource("reg");
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
index 795b7eba..732dc850 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/impl/AbstractAcmeClientTest.java
@@ -105,10 +105,10 @@ public class AbstractAcmeClientTest {
     }
 
     /**
-     * Test that a {@link Registration} can be updated.
+     * Test that a {@link Registration} can be modified.
      */
     @Test
-    public void testUpdateRegistration() throws AcmeException {
+    public void testModifyRegistration() throws AcmeException {
         Registration registration = new Registration();
         registration.setAgreement(agreementUri);
         registration.addContact("mailto:foo2@example.com");
@@ -118,7 +118,7 @@ public class AbstractAcmeClientTest {
             @Override
             public int sendSignedRequest(URI uri, ClaimBuilder claims, Session session, Account account) throws AcmeException {
                 assertThat(uri, is(locationUri));
-                assertThat(claims.toString(), sameJSONAs(getJson("updateRegistration")));
+                assertThat(claims.toString(), sameJSONAs(getJson("modifyRegistration")));
                 assertThat(session, is(notNullValue()));
                 assertThat(account, is(sameInstance(testAccount)));
                 return HttpURLConnection.HTTP_ACCEPTED;
@@ -140,7 +140,7 @@ public class AbstractAcmeClientTest {
 
         TestableAbstractAcmeClient client = new TestableAbstractAcmeClient(connection);
 
-        client.updateRegistration(testAccount, registration);
+        client.modifyRegistration(testAccount, registration);
 
         assertThat(registration.getLocation(), is(locationUri));
         assertThat(registration.getAgreement(), is(agreementUri));
diff --git a/acme4j-client/src/test/resources/json.properties b/acme4j-client/src/test/resources/json.properties
index 60407f68..07be989a 100644
--- a/acme4j-client/src/test/resources/json.properties
+++ b/acme4j-client/src/test/resources/json.properties
@@ -16,7 +16,7 @@ newRegistration = \
   {"resource":"new-reg",\
    "contact":["mailto:foo@example.com"]}
 
-updateRegistration = \
+modifyRegistration = \
   {"resource":"reg",\
    "agreement":"http://example.com/agreement.pdf",\
    "contact":["mailto:foo2@example.com"]}
diff --git a/acme4j-example/src/main/java/org/shredzone/acme4j/ClientTest.java b/acme4j-example/src/main/java/org/shredzone/acme4j/ClientTest.java
index 44a9900d..fb873f49 100644
--- a/acme4j-example/src/main/java/org/shredzone/acme4j/ClientTest.java
+++ b/acme4j-example/src/main/java/org/shredzone/acme4j/ClientTest.java
@@ -234,7 +234,7 @@ public class ClientTest {
             return false;
         }
 
-        client.updateRegistration(account, reg);
+        client.modifyRegistration(account, reg);
         LOG.info("Updated user's T&C");
 
         return true;
diff --git a/src/site/markdown/usage/register.md b/src/site/markdown/usage/register.md
index 6c4074c5..25c48db7 100644
--- a/src/site/markdown/usage/register.md
+++ b/src/site/markdown/usage/register.md
@@ -35,5 +35,5 @@ Registration reg = new Registration();
 reg.setLocation(accountLocationUri);
 reg.setAgreement(agreementUri);
 
-client.updateRegistration(account, reg);
+client.modifyRegistration(account, reg);
 ```