diff --git a/sdk_container/src/third_party/coreos-overlay/coreos/config/env/app-crypt/mit-krb5 b/sdk_container/src/third_party/coreos-overlay/coreos/config/env/app-crypt/mit-krb5
index 18e79e42f3..abb586975c 100644
--- a/sdk_container/src/third_party/coreos-overlay/coreos/config/env/app-crypt/mit-krb5
+++ b/sdk_container/src/third_party/coreos-overlay/coreos/config/env/app-crypt/mit-krb5
@@ -1,4 +1,10 @@
-# work around configure test that cannot be cross compiled :(
+# Work around configure test that cannot be cross compiled :(
+#
+# When checking if this is still applicable, try grepping the
+# configure script for lines with "$cross_compiling", like
+#
+# grep -B 20 -F 'when cross compiling' configure
+
 export krb5_cv_attr_constructor_destructor=yes,yes
 export ac_cv_func_regcomp=yes
 export ac_cv_printf_positional=yes