diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/UpdateCheckReceiver.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/UpdateCheckReceiver.java
index c3c4e2cfd..e580212a7 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/UpdateCheckReceiver.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/UpdateCheckReceiver.java
@@ -64,6 +64,7 @@ public class UpdateCheckReceiver extends BroadcastReceiver {
     private static final String k_NAME = "name";
     private static final String k_AVERS = "avers";
     private static final String k_GVERS = "gvers";
+    private static final String k_GHASH = "ghash";
     private static final String k_INSTALLER = "installer";
     private static final String k_DEVOK = "devOK";
     private static final String k_APP = "app";
@@ -143,6 +144,7 @@ public class UpdateCheckReceiver extends BroadcastReceiver {
 
                 appParams.put( k_AVERS, versionCode );
                 appParams.put( k_GVERS, BuildConstants.GIT_REV );
+                appParams.put( k_GHASH, BuildConstants.GIT_HASH );
                 appParams.put( k_INSTALLER, installer );
                 if ( devOK( context ) ) {
                     appParams.put( k_DEVOK, true );
diff --git a/xwords4/android/scripts/genvers.sh b/xwords4/android/scripts/genvers.sh
index 502a604b6..262b2d0e2 100755
--- a/xwords4/android/scripts/genvers.sh
+++ b/xwords4/android/scripts/genvers.sh
@@ -43,12 +43,14 @@ EOF
 # Eventually this should pick up a tag if we're at one.  That'll be
 # the way to mark a release
 SHORTVERS="$(git describe --always $GITVERSION 2>/dev/null || echo ${GITVERSION}+)"
+GITHASH=$(git rev-parse --verify HEAD)
 
 cat <<EOF > ${BUILD_DIR}/src/org/eehouse/android/${VARIANT}/BuildConstants.java
 // auto-generated (by $(basename $0)); do not edit
 package org.eehouse.android.${VARIANT};
 class BuildConstants {
     public static final String GIT_REV = "$SHORTVERS";
+    public static final String GIT_HASH = "$GITHASH";
     public static final String STRINGS_HASH = "$STRINGS_HASH";
     public static final short CLIENT_VERS_RELAY = $CLIENT_VERS_RELAY;
     public static final boolean CHAT_SUPPORTED = $CHAT_SUPPORTED;