<h4 dir="auto">A small, complete example of the issue</h4>
<p dir="auto"><code class="notranslate">pandas.Timestamp</code> cannot be found at <a href="http://pandas.pydata.org/pandas-docs/version/0.19.0/api.html" rel="nofollow">http://pandas.pydata.org/pandas-docs/version/0.19.0/api.html</a></p>
<h4 dir="auto">Expected Output</h4>
<p dir="auto"><code class="notranslate">pandas.Timestamp</code> to be there</p>
<h4 dir="auto">Output of <code class="notranslate">pd.show_versions()</code></h4>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="pandas: 0.19.0"><pre class="notranslate"><code class="notranslate">pandas: 0.19.0
</code></pre></div>
<details>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="INSTALLED VERSIONS
------------------
commit: None
python: 3.5.2.final.0
python-bits: 64
OS: Linux
OS-release: 4.4.0-45-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.19.0
nose: None
pip: 7.1.0
setuptools: 18.0.1
Cython: None
numpy: 1.11.2
scipy: None
statsmodels: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.5.3
pytz: 2016.7
blosc: None
bottleneck: None
tables: None
numexpr: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: None
boto: None
pandas_datareader: None"><pre class="notranslate"><code class="notranslate">INSTALLED VERSIONS
------------------
commit: None
python: 3.5.2.final.0
python-bits: 64
OS: Linux
OS-release: 4.4.0-45-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.19.0
nose: None
pip: 7.1.0
setuptools: 18.0.1
Cython: None
numpy: 1.11.2
scipy: None
statsmodels: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.5.3
pytz: 2016.7
blosc: None
bottleneck: None
tables: None
numexpr: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: None
boto: None
pandas_datareader: None
</code></pre></div>
</details>
<h4 dir="auto">Additional info</h4>
<ol dir="auto">
<li>It's a bit inconvenient for a newcomer to read <a href="http://pandas.pydata.org/pandas-docs/version/0.19.0/timeseries.html" rel="nofollow">Time Series / Date functionality</a> over and over again in order to find out the API of the class.</li>
<li>I can get rid of messages such as <code class="notranslate">WARNING: po:obj reference target not found: pandas.Timestamp</code> coming from Sphinx.</li>
</ol>
<p dir="auto">Follows from discussion in PR  <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="20706290" data-permission-text="Title is private" data-url="https://github.com/pandas-dev/pandas/issues/5160" data-hovercard-type="pull_request" data-hovercard-url="/pandas-dev/pandas/pull/5160/hovercard" href="https://github.com/pandas-dev/pandas/pull/5160">#5160</a>.</p>
<p dir="auto">When adding <code class="notranslate">Timestamp</code> in api.rst to document this class and its methods (as eg done in this commit <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/jorisvandenbossche/pandas/commit/3a8a41dda11d47d337e3f916567e8af2772598c2/hovercard" href="https://github.com/jorisvandenbossche/pandas/commit/3a8a41dda11d47d337e3f916567e8af2772598c2">jorisvandenbossche@<tt>3a8a41d</tt></a>), you get warnings when building the docs like for example:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="WARNING: error while formatting arguments for pandas.Timestamp.to_period: 
&lt;cyfunction Timestamp.to_period at 0x00000000057616C0&gt; is not a Python 
function."><pre class="notranslate"><code class="notranslate">WARNING: error while formatting arguments for pandas.Timestamp.to_period: 
&lt;cyfunction Timestamp.to_period at 0x00000000057616C0&gt; is not a Python 
function.
</code></pre></div>
<p dir="auto"><code class="notranslate">Timestamp</code> is a python class in a cython file (so I suppose then it is a cython class). You get the warnings for all methods that are defined in this class (defined here <a href="https://github.com/pydata/pandas/blob/master/pandas/tslib.pyx#L130">https://github.com/pydata/pandas/blob/master/pandas/tslib.pyx#L130</a>), but not for inherited functions of _Timestamp or datetime.</p>
<p dir="auto">It seems that the generated docstring pages are built (so with the docstring rendered), but that Sphinx could not detect the signature.</p>
<p dir="auto">Does somebody know how to let Sphinx handle cython classes/functions?</p>