diff --git a/man7/time.7 b/man7/time.7
index 9cd1872a0..cb72f0bf7 100644
--- a/man7/time.7
+++ b/man7/time.7
@@ -101,6 +101,9 @@ On a system that supports HRTs, the accuracy of sleep and timer
 system calls is no longer constrained by the jiffy,
 but instead can be as accurate as the hardware allows
 (microsecond accuracy is typical of modern hardware).
+
+HRTs are not supported on all hardware architectures.
+(Support is provided on x86, arm, and powerpc, among others.)
 .SS "The Epoch"
 Unix systems represent time in seconds since the
 .IR Epoch ,