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+## New `not_found_message` for dependency
+
+You can now specify a `not_found_message` that will be printed if the
+specified dependency was not found. The point is to convert constructs
+that look like this:
+
+```meson
+d = dependency('something', required: false)
+if not d.found()
+ message('Will not be able to do something.')
+endif
+```
+
+Into this:
+
+```meson
+d = dependency('something',
+ required: false,
+ not_found_message: 'Will not be able to do something.')
+```
+
+Or constructs like this:
+
+```meson
+d = dependency('something', required: false)
+if not d.found()
+ error('Install something by doing XYZ.')
+endif
+```
+
+into this:
+
+```meson
+d = dependency('something',
+ not_found_message: 'Install something by doing XYZ.')
+```
+
+Which works, because the default value of `required` is `true`.