diff --git a/java/google/registry/flows/domain/BaseDomainUpdateFlow.java b/java/google/registry/flows/domain/BaseDomainUpdateFlow.java
index 98a72d8ad..a33d35c19 100644
--- a/java/google/registry/flows/domain/BaseDomainUpdateFlow.java
+++ b/java/google/registry/flows/domain/BaseDomainUpdateFlow.java
@@ -79,7 +79,7 @@ public abstract class BaseDomainUpdateFlow<R extends DomainBase, B extends Build
             : new MaxSigLifeChangeNotSupportedException();
       }
       Set<DelegationSignerData> newDsData = existingResource.getDsData();
-      // RFC 5901 specifies that removes are processed before adds.
+      // RFC 5910 specifies that removes are processed before adds.
       Remove remove = secDnsUpdate.getRemove();
       if (remove != null) {
         if (Boolean.FALSE.equals(remove.getAll())) {  // Explicit all=false is meaningless.