Document that per-file lines should not contain additional spaces
Signed-off-by: Edwin Kempin <email@example.com>
diff --git a/resources/Documentation/backend-find-owners.md b/resources/Documentation/backend-find-owners.md
index 9d2fab5..223cebb 100644
@@ -266,6 +266,13 @@
+**NOTE:** It's important to not include additional spaces in `per-file` lines.
+E.g. "per-file docs.config, firstname.lastname@example.org" will make
+Richard Roe a code owner of the files "docs.config" and " test.config" (pay
+attention to the leading space), but not for the file "test.config". The correct
+line to make Richard Roe a code owner of the files "docs.config" and
+"test.config" would be "per-file docs.config,email@example.com".
##### <a id="doNotUsePathExpressionsForSubdirectories">
**NOTE:** It is discouraged to use path expressions that explicitly name
subdirectories such as `my-subdir/*` as they will break when the subdirectory