diff --git a/src/main.ts b/src/main.ts
index 8384041..541fbba 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -84,9 +84,9 @@ export default class CustomSortPlugin extends Plugin {
 				// - the file explicitly indicated in documentation, by default Inbox/Inbox.md
 				if (aFile.name === SORTSPEC_FILE_NAME ||
 					aFile.basename === parent.name ||
-					aFile.basename === this.settings.additionalSortspecFile ||
-					aFile.path === this.settings.additionalSortspecFile ||
-					aFile.path === this.settings.additionalSortspecFile + '.md'
+					aFile.basename === this.settings.additionalSortspecFile ||  // (A) 'Inbox/sort' === setting 'Inbox/sort'
+					aFile.path === this.settings.additionalSortspecFile ||      // (B) 'Inbox/sort.md' === setting 'Inbox/sort.md'
+					aFile.path === this.settings.additionalSortspecFile + '.md' // (C) 'Inbox/sort.md.md' === setting 'Inbox/sort.md'
 				) {
 					const sortingSpecTxt: string = mCache.getCache(aFile.path)?.frontmatter?.[SORTINGSPEC_YAML_KEY]
 					if (sortingSpecTxt) {