diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 2d6ddc22aee..b74530acc61 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -3,6 +3,7 @@ information provided here is intended especially for developers.
 
 === 2.7 ===
 
+* PHPUnit cannot be installed via PEAR any more, please use composer package manager instead.
 * $core_renderer->block_move_target() changed to support more verbose move-block-here descriptions.
 
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