--- a/src/cpu_set.rs
+++ b/src/cpu_set.rs
@@ -42,17 +42,18 @@
 }
 
 #[cfg(target_pointer_width = "64")]
-pub const MAX_CPU_COUNT: u32 = 128;
+pub const MAX_CPU_COUNT: u32 = 256;
 
 #[cfg(target_pointer_width = "32")]
 pub const MAX_CPU_COUNT: u32 = 32;
 
 const SET_WORDS: usize = (MAX_CPU_COUNT / usize::BITS) as usize;
 
-// TODO: Support more than 128 CPUs.
+// TODO: Support more than 256 CPUs.
 // The maximum number of CPUs on Linux is configurable, and the type for LogicalCpuSet and
 // LogicalCpuId may be optimized accordingly. In that case, box the mask if it's larger than some
-// base size (probably 256 bytes).
+// base size (probably 256 bytes). AMD EPYC has 128C/256T, Threadripper PRO 96C/192T —
+// 256 covers current hardware.
 #[derive(Debug)]
 pub struct LogicalCpuSet([AtomicUsize; SET_WORDS]);