diff --git a/_posts/2024-08-07-flexattention.md b/_posts/2024-08-07-flexattention.md
index 4c34879d33b6..d601bc085c58 100644
--- a/_posts/2024-08-07-flexattention.md
+++ b/_posts/2024-08-07-flexattention.md
@@ -218,12 +218,12 @@ def sliding_window_causal(b, h, q_idx, kv_idx):
     return causal_mask & window_mask
 
 # If you want to be cute...
-from torch.nn.attention import or_masks
+from torch.nn.attention import and_masks
 
 def sliding_window(b, h, q_idx, kv_idx)
     return q_idx - kv_idx <= SLIDING_WINDOW
 
-sliding_window_causal = or_masks(causal_mask, sliding_window)
+sliding_window_causal = and_masks(causal_mask, sliding_window)
 ```
 
 We benchmark it against `F.scaled_dot_product_attention` with a sliding window mask as well as FA2 with a causal mask (as a reference point for performance). Not only are we significantly faster than `F.scaled_dot_product_attention`, we’re *also* significantly faster than FA2 with a causal mask as this mask has significantly more sparsity.
@@ -479,4 +479,4 @@ We want to highlight some prior work (and people) that have inspired FlexAttenti
 - The Jax team's work on SplashAttention
 - Philippe Tillet and Keren Zhou for helping us with Triton 
 - Ali Hassani for discussions on neighborhood attention
-- Everybody who's complained about attention kernels not supporting their favorite attention variant :)
\ No newline at end of file
+- Everybody who's complained about attention kernels not supporting their favorite attention variant :)