diff --git a/docs/explanation.md b/docs/explanation.md
index 5f5f5620..42eef9bf 100644
--- a/docs/explanation.md
+++ b/docs/explanation.md
@@ -2,10 +2,12 @@
 
 ## Key Concepts
 
-- **_undeclared_ dependency**: a package that's used (in particular, `import`ed) by a project and which lacks a corresponding declaration to ensure that it's available.
+- **_undeclared_ dependency**:
+  a package that's used (in particular, `import`ed) by a project and which lacks a corresponding declaration to ensure that it's available.
   For example, you `import numpy`, but you've forgotten to include `numpy` in your `requirements.txt`.
   Pragmatically, this means the project is prone to runtime errors.
-- **_unused_ dependency**: a package that's declared as necessary for a project but which is never used by project code.
+- **_unused_ dependency**:
+  a package that's declared as necessary for a project but which is never used by project code.
   For example, you have `numpy` listed in your `requirements.txt`, but you never actually `import numpy`.
   Pragmatically, this means that project installation may consume more space than needed and will be more likely to break with future software releases; in short, these are costs paid for no benefit.
 
@@ -25,7 +27,7 @@ FawltyDeps (each of which is introduced in the following subsections):
 - Identity mapping
 - User-defined mapping
 
-<img src="./images/resolvers_sequence.png" alt="Sequence of resolvers used by FawltyDeps" width="500"/>
+![Sequence of resolvers used by FawltyDeps](images/resolvers_sequence.png)
 
 The priority of each of these mappings, together with their default values and
 customization options are summarized in the table below:
diff --git a/docs/how_to_guides.md b/docs/how_to_guides.md
index 97980944..1e15519d 100644
--- a/docs/how_to_guides.md
+++ b/docs/how_to_guides.md
@@ -1,6 +1,8 @@
 # How-to guides
 
-## How not to display tools like `black` and `pylint` in _unused dependencies_?
+## Not displaying development tools
+
+How not to display tools like `black` and `pylint` in _unused dependencies_?
 
 By default, all packages declared as dependencies by your project are included
 in the FawltyDeps analysis, even if they only contain tools that were not meant
@@ -14,7 +16,7 @@ fawltydeps --ignore-unused black pylint
 or add an equivalent directive to the FawltyDeps configuration in your
 `pyproject.toml` (see below).
 
-## How can I store my `fawltydeps` command line options in a configuration file?
+## Storing `fawltydeps` options in a configuration file.
 
 You can run:
 
@@ -38,7 +40,7 @@ to get this:
 ignore_unused = ["black", "pylint"]
 ```
 
-## How to use FawltyDeps in a monorepo?
+## FawltyDeps with a monorepo.
 
 Running `fawltydeps` without arguments at the root of a monorepo
 will most likely not give you a useful result:
@@ -65,7 +67,7 @@ run for each `libX`:
 fawltydeps libX
 ```
 
-## Passing Python code to FawltyDeps via standard input.
+## Passing Python code via standard input.
 
 The `--code` argument accepts a single hyphen (`-`) as a special value meaning
 that code should be read from standard input. When using this you may pipe or
@@ -86,7 +88,7 @@ fawltydeps --code -
 # then press Ctrl+D to signal EOF (end-of-file).
 ```
 
-## Using FawltyDeps as a pre-commit hook
+## Pre-commit hook
 
 Assuming that you already use the [pre-commit](https://pre-commit.com)
 tool, you can add something like this to your project's
diff --git a/images/resolvers_sequence.png b/docs/images/resolvers_sequence.png
similarity index 100%
rename from images/resolvers_sequence.png
rename to docs/images/resolvers_sequence.png
diff --git a/mkdocs.yml b/mkdocs.yml
index ceee076d..823319af 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -5,6 +5,10 @@ theme:
   palette:
     primary: 'indigo'
     accent: 'light blue'
+  hjls_language:
+    - python
+    - yaml
+    - json
 nav:
   - Home: index.md
   - Installation: installation.md