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-rw-r--r--TOOLS/lua/observe-all.lua4
1 files changed, 4 insertions, 0 deletions
diff --git a/TOOLS/lua/observe-all.lua b/TOOLS/lua/observe-all.lua
index 9bfdf44992..be9f7270e4 100644
--- a/TOOLS/lua/observe-all.lua
+++ b/TOOLS/lua/observe-all.lua
@@ -1,4 +1,8 @@
-- Test script for property change notification mechanism.
+-- Note that watching/reading some properties can be very expensive, or
+-- require the player to synchronously wait on network (when playing
+-- remote files), so you should in general only watch properties you
+-- are interested in.
local utils = require("mp.utils")