diff --git a/kernel/src/drivers/block/ahci.rs b/kernel/src/drivers/block/ahci.rs
index 2d445f1..d05658c 100644
--- a/kernel/src/drivers/block/ahci.rs
+++ b/kernel/src/drivers/block/ahci.rs
@@ -87,7 +87,7 @@ bitflags! {
         const CCCS = 1 << 7;
         const EMS = 1 << 6;
         const SXS = 1 << 5;
-        // number of ports = 1
+        // number of ports - 1
         const NUM_MASK = 0b11111;
     }
 }
diff --git a/user b/user
index ec476c3..b1e7a2d 160000
--- a/user
+++ b/user
@@ -1 +1 @@
-Subproject commit ec476c3acb600c6d437454e74fb3e0eb6c452de4
+Subproject commit b1e7a2d07e81ce5035a1cc25b0ade9367aee1a94