diff --git a/introspection/org.freedesktop.ModemManager1.Modem.Signal.xml b/introspection/org.freedesktop.ModemManager1.Modem.Signal.xml
index 1039870d..fa85d5d3 100644
--- a/introspection/org.freedesktop.ModemManager1.Modem.Signal.xml
+++ b/introspection/org.freedesktop.ModemManager1.Modem.Signal.xml
@@ -69,6 +69,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Frame error rate, in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.2
@@ -117,6 +126,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Packet error rate, in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.2
@@ -141,6 +159,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Bit error rate (BER), in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.2
@@ -181,6 +208,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Block error rate (BLER), in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.2
@@ -229,6 +265,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Block error rate (BLER), in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.2
@@ -269,6 +314,15 @@
             </para>
           </listitem>
         </varlistentry>
+        <varlistentry><term><literal>"error-rate"</literal></term>
+          <listitem>
+            <para>
+              Block error rate (BLER), in percentage value, given as a
+              floating point value (signature <literal>"d"</literal>).
+              Since: 1.20.
+            </para>
+          </listitem>
+        </varlistentry>
         </variablelist>
 
         Since: 1.16