diff --git a/README.md b/README.md
index 482efc0..66dbc19 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,20 @@ Run this command to enable the `Generate Test Coverage` and `Instrument Program
 ```sh
 $ slather setup path/to/project.xcodeproj
 ```
+## General Usage Notes
+### Commandline Arguments Win
+When using both a config file (`.slather.yml`) and providing arguments via the commandline,
+the arguments will take precedence over the matching setting in the config file.
 
+### `ignore` always wins over `source-files`
+When defining both files that should be ignored (`--ignore`, ignore) and source files to include (`--source-files`, source_files),
+the ignore list is checked first. If the file being scanned matches a glob in the ignore list, it will not be included. In this case, the
+source_file list is not checked.
+
+If the file being scanned is not in the ignore list, and source_file has been defined, the source_file list is
+checked. If the source file matches a glob, it will be included.
+
+## CI Integration
 ### Usage with Codecov
 
 Login to [Codecov](https://codecov.io/) (no need to activate a repository, this happens automatically). Right now, `slather` supports Codecov via **all** supported CI providers [listed here](https://github.com/codecov/codecov-bash#ci-providers).
diff --git a/lib/slather/command/coverage_command.rb b/lib/slather/command/coverage_command.rb
index a0e9306..fc3742f 100644
--- a/lib/slather/command/coverage_command.rb
+++ b/lib/slather/command/coverage_command.rb
@@ -174,7 +174,7 @@ def setup_arch
   end
 
   def setup_source_files
-    project.source_files = source_files if !source_files.empty?
+    project.source_files = source_files_list if !source_files_list.empty?
   end
 
   def setup_decimals
diff --git a/lib/slather/project.rb b/lib/slather/project.rb
index 4998dff..4f54545 100755
--- a/lib/slather/project.rb
+++ b/lib/slather/project.rb
@@ -383,7 +383,6 @@ def configure_ignore_list
 
     def configure_source_files
       self.source_files ||= [(self.class.yml["source_files"] || [])].flatten
-      puts self.source_files.to_json
     end
 
     def configure_ci_service