diff --git a/arviz/plots/rankplot.py b/arviz/plots/rankplot.py
index 7d4b2707a1..3729524b20 100644
--- a/arviz/plots/rankplot.py
+++ b/arviz/plots/rankplot.py
@@ -68,7 +68,7 @@ def plot_rank(
         Coordinates of var_names to be plotted. Passed to `Dataset.sel`
     bins: None or passed to np.histogram
         Binning strategy used for histogram. By default uses twice the result of Sturges' formula.
-        See `np.histogram` documentation for, other available arguments.
+        See :func:`numpy.histogram` documentation for, other available arguments.
     kind: string
         If bars (defaults), ranks are represented as stacked histograms (one per chain). If vlines
         ranks are represented as vertical lines above or below `ref_line`.
diff --git a/doc/source/conf.py b/doc/source/conf.py
index e591292621..44c8bf319c 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -287,4 +287,5 @@
     "bokeh": ("https://docs.bokeh.org/en/latest/", None),
     "scipy": ("https://docs.scipy.org/doc/scipy/reference/", None),
     "zarr": ("https://zarr.readthedocs.io/en/stable/", None),
+    "numpy": ("https://numpy.org/doc/stable/", None)
 }