diff --git a/packages/tool-cache/src/tool-cache.ts b/packages/tool-cache/src/tool-cache.ts
index 9ab2deb5..c932ab77 100644
--- a/packages/tool-cache/src/tool-cache.ts
+++ b/packages/tool-cache/src/tool-cache.ts
@@ -183,11 +183,11 @@ export async function extract7z(
 }
 
 /**
- * Extract a tar
+ * Extract a compressed tar archive
  *
  * @param file     path to the tar
  * @param dest     destination directory. Optional.
- * @param flags    flags for the tar. Optional.
+ * @param flags    flags for the tar command to use for extraction. Defaults to 'xz' (extracting gzipped tars). Optional.
  * @returns        path to the destination directory
  */
 export async function extractTar(