1 files changed, 1 insertions, 1 deletions
diff --git a/README.md b/README.md
index 14ce202..43d6d3c 100644
--- a/README.md
+++ b/README.md
@@ -124,7 +124,7 @@ are prefixed with 'Module_'.
 | **_Module_8_c_1_** | yes    | 211  | |
 | 8_c_2          | yes    |      | |
 | **_8_d_1_**    | yes    | 212  | |
-| **_9_a_1_**    |        | 221  | 9. I/O case study: a library for searching the filesystem |
+| **_9_a_1_**    | yes    | 221  | 9. I/O case study: a library for searching the filesystem |
 | **_9_b_1_**    |        | 228  | |
 | 9_b_2          |        |      | |
 | 9_b_3          |        |      | |