diff --git a/src/brevitas/optim/sign_sgd.py b/src/brevitas/optim/sign_sgd.py
index 70090916a..24e2b81c4 100644
--- a/src/brevitas/optim/sign_sgd.py
+++ b/src/brevitas/optim/sign_sgd.py
@@ -64,7 +64,7 @@
 
 
 class SignSGD(Optimizer):
-    """Implements signed stochastic gradient descent (optionally with momentum).
+    r"""Implements signed stochastic gradient descent (optionally with momentum).
 
     .. math::
        \begin{aligned}