diff --git a/core/api/current.txt b/core/api/current.txt
index e392bd3..958b2f9 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -39618,7 +39618,7 @@
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setKeyValidityForOriginationEnd(java.util.Date);
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setKeyValidityStart(java.util.Date);
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setMaxUsageCount(int);
-    method @FlaggedApi("MGF1_DIGEST_SETTER") @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setMgf1Digests(@Nullable java.lang.String...);
+    method @FlaggedApi("MGF1_DIGEST_SETTER") @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setMgf1Digests(@NonNull java.lang.String...);
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setRandomizedEncryptionRequired(boolean);
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setSignaturePaddings(java.lang.String...);
     method @NonNull public android.security.keystore.KeyGenParameterSpec.Builder setUnlockedDeviceRequired(boolean);
diff --git a/keystore/java/android/security/keystore/KeyGenParameterSpec.java b/keystore/java/android/security/keystore/KeyGenParameterSpec.java
index b714035..231fa48 100644
--- a/keystore/java/android/security/keystore/KeyGenParameterSpec.java
+++ b/keystore/java/android/security/keystore/KeyGenParameterSpec.java
@@ -1282,15 +1282,18 @@
          * function (MGF1) with a digest.
          * The default digest for MGF1 is {@code SHA-1}, which will be specified during key creation
          * time if no digests have been explicitly provided.
-         * When using the key, the caller may not specify any digests that were not provided during
-         * key creation time. The caller may specify the default digest, {@code SHA-1}, if no
+         * {@code null} may not be specified as a parameter to this method: It is not possible to
+         * disable MGF1 digest, a default must be present for when the caller tries to use it.
+         *
+         * <p>When using the key, the caller may not specify any digests that were not provided
+         * during key creation time. The caller may specify the default digest, {@code SHA-1}, if no
          * digests were explicitly provided during key creation (but it is not necessary to do so).
          *
          * <p>See {@link KeyProperties}.{@code DIGEST} constants.
          */
         @NonNull
         @FlaggedApi("MGF1_DIGEST_SETTER")
-        public Builder setMgf1Digests(@Nullable @KeyProperties.DigestEnum String... mgf1Digests) {
+        public Builder setMgf1Digests(@NonNull @KeyProperties.DigestEnum String... mgf1Digests) {
             mMgf1Digests = Set.of(mgf1Digests);
             return this;
         }