diff --git a/multimedia/videoutils/ffmpeg.xml b/multimedia/videoutils/ffmpeg.xml
index 591f48b2a4..03fc7f7e90 100644
--- a/multimedia/videoutils/ffmpeg.xml
+++ b/multimedia/videoutils/ffmpeg.xml
@@ -107,6 +107,7 @@
       <xref linkend="fontconfig"/>,
       <xref linkend="frei0r"/>,
       <xref linkend="libcdio"/> (to identify and play CDs),
+      <xref linkend="libdrm"/> (for <quote>kmsgrab</quote> input),
       <xref linkend="libwebp"/>,
       <xref linkend="opencv"/>,
       <xref linkend="openjpeg2"/>,
@@ -352,6 +353,12 @@ grep ^TEST ../fate.log | wc -l</userinput></screen>
       rendering via <filename class="libraryfile">libass</filename>.
     </para>
 
+    <para>
+      <option>--enable-libdrm</option>: Use it if <xref linkend="libdrm"/>
+      is installed, to build <quote>kmsgrab</quote> input module which is
+      useful for screen capturing or streaming.
+    </para>
+
     <para>
       <parameter>--enable-libfdk-aac</parameter>: Enables currently the
       highest-quality AAC audio encoding via <filename