diff --git a/stable/presentation-time/presentation-time.xml b/stable/presentation-time/presentation-time.xml
index c2431c5..35eace2 100644
--- a/stable/presentation-time/presentation-time.xml
+++ b/stable/presentation-time/presentation-time.xml
@@ -25,7 +25,7 @@
     DEALINGS IN THE SOFTWARE.
   </copyright>
 
-  <interface name="wp_presentation" version="2">
+  <interface name="wp_presentation" version="3">
     <description summary="timed presentation related wl_surface requests">
 
 <!-- Introduction -->
@@ -123,7 +123,7 @@
 
   </interface>
 
-  <interface name="wp_presentation_feedback" version="2">
+  <interface name="wp_presentation_feedback" version="3">
     <description summary="presentation time feedback event">
       A presentation_feedback object returns an indication that a
       wl_surface content update has become visible to the user.
@@ -195,6 +195,23 @@
           fullscreen surface and a surface on a hardware overlay.
         </description>
       </entry>
+      <entry name="fixed_rate" value="0x10" since="3">
+        <description summary="presentation is at a fixed refresh rate">
+          The display hardware is operating at a fixed refresh rate.
+          The presentation was aligned to a multiple of the previous event's
+          'refresh' argument.
+          If this is set, the refresh argument must not be 0.
+        </description>
+      </entry>
+      <entry name="variable_rate" value="0x20" since="3">
+        <description summary="presentation is at a variable refresh rate">
+          The display hardware is operating at a variable refresh rate driven
+          by the surface.
+          The presentation occurred as soon as possible after the interval
+          in the previous event's 'refresh' argument.
+          If this is set, the refresh argument must not be 0.
+        </description>
+      </entry>
     </enum>
 
     <event name="presented" type="destructor">
@@ -231,6 +248,11 @@
         For version 1, if the output does not have a constant refresh rate,
         the refresh argument must be zero.
 
+        If the 'fixed_rate' flag is set, then the refresh argument is
+        the output's constant refresh rate. If the 'variable_rate' flag
+        is set, then the refresh argument is the output's fastest refresh
+        rate.
+
         The 64-bit value combined from seq_hi and seq_lo is the value
         of the output's vertical retrace counter when the content
         update was first scanned out to the display. This value must