diff --git a/README.md b/README.md
index b8d942b..5f00600 100644
--- a/README.md
+++ b/README.md
@@ -75,15 +75,14 @@ mvt completion bash
 ```
 
 MVT only writes completion files or shell configuration when `--install` is passed. See the [command completion documentation](https://docs.mvt.re/en/latest/command_completion/) for details.
-Module-running `check-*` commands can load custom Python modules with
-`--load-module PATH` or from a folder set in `MVT_CUSTOM_MODULES`. See the
-[development documentation](https://docs.mvt.re/en/latest/development/) for
-details.
 
-Users can also add top-level commands to `mvt`, `mvt-ios` and `mvt-android`
-from installed Python packages or local files and folders. See the
+Plugin packages extend MVT with additional forensic modules, which run inside
+the `check-*` commands, and with top-level commands on `mvt`, `mvt-ios` and
+`mvt-android`. See the
+[development documentation](https://docs.mvt.re/en/latest/development/) for
+writing and installing them, and the
 [custom CLI command documentation](https://docs.mvt.re/en/latest/development/custom_commands/)
-for the plugin entry points and `--load-command` interface.
+for the entry points a package registers commands in.
 
 
 ## License
diff --git a/docs/development/custom_commands.md b/docs/development/custom_commands.md
index cae0631..19cdb85 100644
--- a/docs/development/custom_commands.md
+++ b/docs/development/custom_commands.md
@@ -85,10 +85,13 @@ plugin it belongs to, so name it after the plugin, and make it a Click group
 when the plugin has several operations to offer, such as
 `mvt my-plugin configure`.
 
-## Load a Command File
+## Developing a Command Locally
 
-For local commands that are not packaged, create a Python file that exports one
-Click command or group named `cli`:
+A package is how a command is distributed. While a command is being written,
+MVT can load it straight from its file instead, so the package need not be
+reinstalled after every change; an editable install of the package does the
+same through its entry points. Create a Python file that exports one Click
+command or group named `cli`:
 
 ```python
 import click