diff --git a/AUTHORS.rst b/AUTHORS.rst
index d5b9297d7..1090d2f03 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -10,15 +10,21 @@ please add your name using this markdown template:
 
 You can copy/paste the template with backticks (not quotation marks).
 
+Contributions that did not leave a commit trace
+are indicated in bullet points below each user's username.
+
 Leads
 -----
 
 - `@ericmjl <https://github.com/ericmjl>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Aericmjl>`_
 - `@szuckerman <https://github.com/szuckerman>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Aszuckerman>`_
 - `@zbarry <https://github.com/zbarry>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Azbarry>`_
+    - Co-led sprint at SciPy 2019.
 - `@HectorM14 <https://github.com/HectorM14>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3AHectorM14>`_
 - `@jk3587 <https://github.com/jk3587>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Ajk3587>`_
+    - Tagged issues at SciPy 2019.
 - `@sallyhong <https://github.com/sallyhong>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Asallyhong>`_
+    - Tagged issues at SciPy 2019.
 
 Contributors
 ------------
@@ -30,6 +36,7 @@ Contributors
 - `@CWen001 <https://github.com/CWen001>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3ACWen001>`_
 - `@bhallaY <https://github.com/bhallaY>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3AbhallaY>`_
 - `@jekwatt <https://github.com/jekwatt>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Ajekwatt>`_
+    - Helped other sprinters with ``git`` issues at SciPy 2019.
 - `@kurtispinkney <https://github.com/kurtispinkney>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Akurtispinkney>`_
 - `@lphk92 <https://github.com/lphk92>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Alphk92>`_
 - `@jonnybazookatone <https://github.com/jonnybazookatone>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Ajonnybazookatone>`_
@@ -53,6 +60,7 @@ Contributors
 - `@TomMonks <https://github.com/TomMonks>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Atommonks>`_
 - `@benjaminjack <https://github.com/benjaminjack>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Abenjaminjack>`_
 - `@loganthomas <https://github.com/loganthomas>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Aloganthomas>`_
+    - Helped others with ``git`` issues at SciPy 2019.
 - `@kulini <https://github.com/kulini>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+kulini>`_
 - `@dwgoltra <https://github.com/dwgoltra>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Aclosed+mentions%3Adwgoltra>`_
 - `@shandou <https://github.com/shandou>`_ | `contributions <https://github.com/ericmjl/pyjanitor/pulls?utf8=%E2%9C%93&q=is%3Apr+author%3Ashandou>`_