fix typo

README.md

@@ -31,6 +31,6 @@ v1.0 of the notebooks require v1.1.0 of Pyleoclim and associated requirements de
 All notebooks herein are provided under an [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) license.
 
 ## Citation
-We needn't tell you that making research tools accessible requires time and effort. If you find any of these resources useful and use them in your own research, please do us the kindness of one or more citations. Notebooks in this collection is registered on Zenodo, and associated with a digital object identifier (DOI).  A ready-to-use citation is provided on this GitHub repository in APA and BibTex (in the About section on the right panel, click on "Cite this repository"). If you use any of the standards (LiPD) or the software (Pyleoclim), please cite them as well. It will make us (and NSF!) very happy to hear that these investments spawned more research.
+We needn't tell you that making research tools accessible requires time and effort. If you find any of these resources useful and use them in your own research, please do us the kindness of one or more citations. Notebooks in this collection are registered on Zenodo, and associated with a digital object identifier (DOI).  A ready-to-use citation is provided in this GitHub repository in APA and BibTex (in the About section on the right panel, click on "Cite this repository"). If you use any of the standards (LiPD) or the software (Pyleoclim), please cite them as well. It will make us (and NSF!) very happy to hear that these investments spawned more research.
 
 If you use any of the data on this repository, please cite the original authors of the study. 

docs/README.html

@@ -425,7 +425,7 @@ <h2>License<a class="headerlink" href="#license" title="Link to this heading">#<
 </section>
 <section id="citation">
 <h2>Citation<a class="headerlink" href="#citation" title="Link to this heading">#</a></h2>
-<p>We needn’t tell you that making research tools accessible requires time and effort. If you find any of these resources useful and use them in your own research, please do us the kindness of one or more citations. Notebooks in this collection is registered on Zenodo, and associated with a digital object identifier (DOI).  A ready-to-use citation is provided on this GitHub repository in APA and BibTex (in the About section on the right panel, click on “Cite this repository”). If you use any of the standards (LiPD) or the software (Pyleoclim), please cite them as well. It will make us (and NSF!) very happy to hear that these investments spawned more research.</p>
+<p>We needn’t tell you that making research tools accessible requires time and effort. If you find any of these resources useful and use them in your own research, please do us the kindness of one or more citations. Notebooks in this collection are registered on Zenodo, and associated with a digital object identifier (DOI).  A ready-to-use citation is provided on this GitHub repository in APA and BibTex (in the About section on the right panel, click on “Cite this repository”). If you use any of the standards (LiPD) or the software (Pyleoclim), please cite them as well. It will make us (and NSF!) very happy to hear that these investments spawned more research.</p>
 <p>If you use any of the data on this repository, please cite the original authors of the study.</p>
 </section>
 <div class="toctree-wrapper compound">