diff --git a/gensim/similarities/termsim.py b/gensim/similarities/termsim.py
index 722dc5f6d7..a7887ef435 100644
--- a/gensim/similarities/termsim.py
+++ b/gensim/similarities/termsim.py
@@ -303,10 +303,15 @@ def inner_product(self, X, Y, normalized=False):
         References
         ----------
         The soft cosine measure was perhaps first described by [sidorovetal14]_.
+        Further notes on the efficient implementation of the soft cosine measure are described by
+        [novotny18]_.
 
         .. [sidorovetal14] Grigori Sidorov et al., "Soft Similarity and Soft Cosine Measure: Similarity
            of Features in Vector Space Model", 2014, http://www.cys.cic.ipn.mx/ojs/index.php/CyS/article/view/2043/1921.
 
+        .. [novotny18] Vít Novotný, "Implementation Notes for the Soft Cosine Measure", 2018,
+           http://dx.doi.org/10.1145/3269206.3269317.
+
         """
         if not X or not Y:
             return self.matrix.dtype.type(0.0)