diff --git a/man2/adjtimex.2 b/man2/adjtimex.2
index 7a174edce..2325bcfd5 100644
--- a/man2/adjtimex.2
+++ b/man2/adjtimex.2
@@ -106,6 +106,12 @@ error occurs if the supplied value is out of range.
 .BR ADJ_FREQUENCY
 Set frequency offset from
 .IR buf.freq .
+Since Linux 2.6.26,
+.\" commit 074b3b87941c99bc0ce35385b5817924b1ed0c23
+the supplied value is clamped to the range (\-32768000, +32768000).
+In older kernels, an
+.IB EINVAL
+error occurs if the supplied value is out of range.
 .TP
 .BR ADJ_MAXERROR
 Set maximum time error from
@@ -386,6 +392,13 @@ does not point to writable memory.
 .TP
 .BR EINVAL " (kernels before Linux 2.6.26)"
 An attempt was made to set
+.I buf.freq
+to a value outside the range (\-33554432, +33554432).
+.\" From a quck glance, it appears there was no clamping or range check
+.\" for buf.freq in kernels before 2.0
+.TP
+.BR EINVAL " (kernels before Linux 2.6.26)"
+An attempt was made to set
 .I buf.offset
 to a value outside the permitted range.
 In kernels before Linux 2.0, the permitted range was (\-131072, +131072).