diff --git a/CHANGES b/CHANGES
index b6d047466d..4a77c00a7f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+4886.	[doc]		Document dig -u in manpage. [RT #47150]
+
 4885.	[security]	update-policy rules that otherwise ignore the name
 			field now require that it be set to "." to ensure
 			that any type list present is properly interpreted.
diff --git a/bin/dig/dig.docbook b/bin/dig/dig.docbook
index eca77a5de6..7a5f6e4181 100644
--- a/bin/dig/dig.docbook
+++ b/bin/dig/dig.docbook
@@ -349,6 +349,15 @@
 	</listitem>
       </varlistentry>
 
+      <varlistentry>
+	<term>-u</term>
+	<listitem>
+	  <para>
+	    Print query times in microseconds instead of milliseconds.
+	  </para>
+	</listitem>
+      </varlistentry>
+
       <varlistentry>
 	<term>-v</term>
 	<listitem>