diff --git a/man/wtmpdb.8.xml b/man/wtmpdb.8.xml
index 558e9ba..014d05f 100644
--- a/man/wtmpdb.8.xml
+++ b/man/wtmpdb.8.xml
@@ -192,6 +192,27 @@
 		</para>
 	      </listitem>
 	    </varlistentry>
+	    <varlistentry>
+	      <term>
+		<option>--time-format</option>
+		<replaceable>FORMAT</replaceable>
+	      </term>
+	      <listitem>
+		<para>
+		  Display timestamps in the specified
+		  <replaceable>FORMAT</replaceable>. The format can be
+		  <replaceable>notime</replaceable>,
+		  <replaceable>short</replaceable>,
+		  <replaceable>full</replaceable>, or
+		  <replaceable>iso</replaceable>.
+		  <replaceable>notime</replaceable> will not display times at
+		  all, <replaceable>short</replaceable> is the default option,
+		  <replaceable>full</replaceable> will display the full times
+		  and dates, and <replaceable>iso</replaceable> will display
+		  times in ISO-8601 format.
+		</para>
+	      </listitem>
+	    </varlistentry>
 	  </variablelist>
 	  <para>
 	    <replaceable>TIME</replaceable> must be in the format
diff --git a/src/wtmpdb.c b/src/wtmpdb.c
index cdb03e6..aac7b5b 100644
--- a/src/wtmpdb.c
+++ b/src/wtmpdb.c
@@ -541,6 +541,9 @@ usage (int retval)
   fputs ("  -t, --until TIME    Display who was logged in until TIME\n", output);
   fputs ("  -w, --fullnames     Display full IP addresses and user and domain names\n", output);
   fputs ("  -x, --system        Display system shutdown entries\n", output);
+  fputs ("      --time-format FORMAT  Display timestamps in the specified FORMAT:\n", output);
+  fputs ("                              notime|short|full|iso\n", output);
+
   fputs ("  [username...]       Display only entries matching these arguments\n", output);
   fputs ("  [tty...]            Display only entries matching these arguments\n", output);
   fputs ("TIME must be in the format \"YYYY-MM-DD HH:MM:SS\"\n", output);