diff --git a/protobuf_definitions/message_formats.proto b/protobuf_definitions/message_formats.proto
index e19aa318..d3bb1b4b 100644
--- a/protobuf_definitions/message_formats.proto
+++ b/protobuf_definitions/message_formats.proto
@@ -1087,12 +1087,13 @@ enum Resolution {
 // Available camera frame rates.
 //
 // If the requested frame rate is higher than what is supported at the current resolution,
-// the frame rate will be reduced while the resolution is respected.
+// the frame rate will be reduced while the resolution is respected: 60 to 30 and 50 to 25.
 enum Framerate {
   FRAMERATE_UNSPECIFIED = 0; // Framerate not specified.
   FRAMERATE_FPS_30 = 1; // 30 frames per second.
-  FRAMERATE_FPS_25 = 2; // 25 frames per second. (Only supported on Pioneer/Pro/X1/X3)
+  FRAMERATE_FPS_25 = 2; // 25 frames per second.
   FRAMERATE_FPS_60 = 3; // 60 frames per second. (Only supported on X3 Ultra at QHD, 1080p and 720p)
+  FRAMERATE_FPS_50 = 4; // 50 frames per second. (Only supported on X3 Ultra at QHD, 1080p and 720p)
 }
 
 // Which camera to control.