diff --git a/README.md b/README.md
index 47ae6f2..f70abdd 100644
--- a/README.md
+++ b/README.md
@@ -158,6 +158,12 @@ compacting the DB).
This will create a new file called `./results/forceclose-yyyy-mm-dd.json`
which will be needed for the next command.
+
+ If you get the error `non-mandatory-script-verify-flag (Signature must be zero
+ for failed CHECK(MULTI)SIG operation)`, you might be affected by an old bug
+ of `lnd` that was fixed in the meantime. But it means the signature in the
+ force-close transaction is invalid and needs to be fixed. There is [a guide
+ on how to do exactly that here](doc/fix-commitment-tx.md).
9. **Wait for timelocks**: The previous command closed the remaining open
channels by publishing your node's state of the channel. By design of the