1 files changed, 1 insertions, 1 deletions

diff --git a/provider/posts/simmons-intro-to-cat-t/1.2.md b/provider/posts/simmons-intro-to-cat-t/1.2.md
index aeac8d7..c2875ca 100644
--- a/provider/posts/simmons-intro-to-cat-t/1.2.md
+++ b/provider/posts/simmons-intro-to-cat-t/1.2.md
@@ -174,7 +174,7 @@ f(a) & \quad x \in \bar{A} \\
 \end{aligned} \\
 \Phi^\leftarrow : \ca{Set_\bot} & \to \ca{Pfn} \\
 A & \mapsto A - \{ \bot \} \\
-\arr{f}{A}{B} & \mapsto \rest{f}{\left ( A - \{ \bot \} \right )}
+\arr{A}{f}{B} & \mapsto \rest{f}{\left ( A - \{ \bot \} \right )}
 \end{aligned}
 $$
 where $\rest{f}{\bar{A}}$ is total.