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-rw-r--r--docs/known-incompatibilities.md5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/known-incompatibilities.md b/docs/known-incompatibilities.md
index 97e4dad7..e8e6a038 100644
--- a/docs/known-incompatibilities.md
+++ b/docs/known-incompatibilities.md
@@ -59,3 +59,8 @@ read or written through `ReflectionProperty`; only the public methods reach the
`ReflectionClass::getFileName()` and the method bodies do not describe Composer's sources either.
Reflection on objects a plugin creates itself works as usual.
+
+### Output buffering functions
+
+`ob_*()` functions work as usual in PHP, but cannot capture any output from
+Rust side.