meth.log2 doc: add a link to int.bit_length()

diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index d68cf1157c0458d078c4b45cfd018720a0031b0f..62c0f34eefdd96965456c54249554826ede3e51c 100644 (file)
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -191,6 +191,11 @@ Power and logarithmic functions
 
    .. versionadded:: 3.3
 
+   .. seealso::
+
+      :meth:`int.bit_length` returns the number of bits necessary to represent
+      an integer in binary, excluding the sign and leading zeros.
+
 
 .. function:: log10(x)