diff --git a/play-services-core/src/main/java/org/microg/gms/common/PackageUtils.java b/play-services-core/src/main/java/org/microg/gms/common/PackageUtils.java
index 598f09f9..b52b9f80 100644
--- a/play-services-core/src/main/java/org/microg/gms/common/PackageUtils.java
+++ b/play-services-core/src/main/java/org/microg/gms/common/PackageUtils.java
@@ -32,7 +32,11 @@ import static org.microg.gms.common.Constants.GMS_PACKAGE_SIGNATURE_SHA1;
 
 public class PackageUtils {
 
-    private static final String[] KNOWN_GOOGLE_SIGNATURES = {GMS_PACKAGE_SIGNATURE_SHA1, "58e1c4133f7441ec3d2c270270a14802da47ba0e", "24bb24c05e47e0aefa68a58a766179d9b613a600"};
+    private static final String[] KNOWN_GOOGLE_SIGNATURES = {
+            GMS_PACKAGE_SIGNATURE_SHA1 /* Google platform key */,
+            "58e1c4133f7441ec3d2c270270a14802da47ba0e" /* Android Wear */,
+            "24bb24c05e47e0aefa68a58a766179d9b613a600" /* Google Fit/Glass */,
+            "46f6c8987311e131f4f558d8e0ae145bebab6da3" /* Google Classroom */};
 
     public static boolean isGoogleSignedPackages(Context context, String packageName) {
         return Arrays.asList(KNOWN_GOOGLE_SIGNATURES).contains(firstSignatureDigest(context, packageName));