diff --git a/nolds/__init__.py b/nolds/__init__.py
index <HASH>..<HASH> 100644
--- a/nolds/__init__.py
+++ b/nolds/__init__.py
@@ -1,4 +1,4 @@
 from .measures import lyap_r, lyap_e, sampen, hurst_rs, corr_dim, dfa, \
-    binary_n, logarithmic_n, logarithmic_r, expected_h, logmid_n
+    binary_n, logarithmic_n, logarithmic_r, expected_h, logmid_n, expected_rs
 from .datasets import brown72, tent_map, logistic_map, fbm, fgn, qrandom, \
     load_qrandom
diff --git a/nolds/measures.py b/nolds/measures.py
index <HASH>..<HASH> 100644
--- a/nolds/measures.py
+++ b/nolds/measures.py
@@ -836,7 +836,8 @@ def expected_rs(n):
   """
   Calculates the expected (R/S)_n for white noise for a given n.
 
-  This is used as a correction factor in the function hurst_rs.
+  This is used as a correction factor in the function hurst_rs. It uses the
+  formula of Anis-Lloyd-Peters (see [h_3]_).
 
   Args:
     n (int):
updates description of expected_rs and adds it to the exported functions