diff --git a/contributors.md b/contributors.md
index c44884e..a6ee404 100644
--- a/contributors.md
+++ b/contributors.md
@@ -54,10 +54,12 @@ On code hosting platforms such as GitHub, the contribution guide will be created
 
 :::: challenge
 
-TODO 
-
 Create a new file called `CONTRIBUTING.md` and populate it with a few sentences.
 
+- What are the most important things for a new contributor to know?
+- What should a user do if they encounter a bug?
+- What are the common questions that a new developer might have when they work on this research software?
+
 ::::
 
 ## Software project governance
diff --git a/docstrings.md b/docstrings.md
index 18113ea..37a156a 100644
--- a/docstrings.md
+++ b/docstrings.md
@@ -129,7 +129,20 @@ Use the `help()` function to view the documentation string for a function.
 
 ::::::::::::::::: solution
 
-TODO
+Let's view the help text for an in-built [function `abs()`](https://docs.python.org/3/library/functions.html#abs) that finds the absolute value of a number.
+
+```python
+help(abs)
+```
+
+The following text will be printed to the screen@
+
+```output
+Help on built-in function abs in module builtins:
+
+abs(x, /)
+    Return the absolute value of the argument.
+```
 
 ::::::::::::::::::::::::::
 
diff --git a/md5sum.txt b/md5sum.txt
index c5af0a6..647ada1 100644
--- a/md5sum.txt
+++ b/md5sum.txt
@@ -7,10 +7,10 @@
 "links.md" "8184cf4149eafbf03ce8da8ff0778c14" "site/built/links.md" "2024-05-20"
 "episodes/introduction.md" "123579b22c95b6dcb57401b057235db5" "site/built/introduction.md" "2024-08-16"
 "episodes/readmes.md" "7f814493f5072a579424de3222583ebb" "site/built/readmes.md" "2024-07-22"
-"episodes/docstrings.md" "28d95c6f87a20ecb3ece5010a999f8b9" "site/built/docstrings.md" "2024-08-16"
+"episodes/docstrings.md" "144c97b797a8bdeafbaf8a9fae4d2099" "site/built/docstrings.md" "2024-08-16"
 "episodes/readable.md" "1f80fef3634faac146f4d6d324a92a3b" "site/built/readable.md" "2024-08-16"
 "episodes/sites.md" "65aa4c45daf0fd4749034d961dd511c6" "site/built/sites.md" "2024-06-10"
-"episodes/contributors.md" "1ee5921b02ebee9da030e06f06d52d08" "site/built/contributors.md" "2024-08-05"
+"episodes/contributors.md" "1e5a2cae9d5ef5fb6949ebd0abdbfb1d" "site/built/contributors.md" "2024-08-16"
 "episodes/cli.md" "605efa02a00db1bb673591623c31b632" "site/built/cli.md" "2024-06-21"
 "instructors/instructor-notes.md" "cae72b6712578d74a49fea7513099f8c" "site/built/instructor-notes.md" "2024-05-20"
 "learners/acknowledgements.md" "a751175e5c52ccbf05f8291162bc2cea" "site/built/acknowledgements.md" "2024-08-16"