1 files changed, 1 insertions, 1 deletions
diff --git a/README.md b/README.md
index a1f2127..6d2b5b1 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ are prefixed with 'Module_'.
 | **_12_a_1_**   | yes    | 274  | 12. Barcode recognition |
 | 12_a_2         | yes, in 12_a_1  |      | |
 | 12_a_3         | yes, in 12_a_1  |      | |
-| **_13_a_1_**   |        | 316  | 13. Data structures |
+| **_13_a_1_**   | yes    | 316  | 13. Data structures |
 | **_14_a_1_**   |        | 352  | 14. Monads |
 | **_15_a_1_**   |        | 382  | 15. Programming with monads |
 | 15_a_2         |        |      | |