diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index 3a84174..2064b1b 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -61,7 +61,7 @@
 			// because we don't want to spam the build output with "nothing
 			// changed" messages, so redirect output message to $out, and if
 			// changes were detected print the output and fail.
-			Command:     "$stgdiff $args --stg $in -o $out || (cat $out && false)",
+			Command:     "$stgdiff $args --stg $in -o $out || (cat $out && false; echo 'Run $$ANDROID_BUILD_TOP/development/tools/ndk/update_ndk_abi.sh to update the ABI dumps.')",
 			CommandDeps: []string{"$stgdiff"},
 		}, "args")