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-rw-r--r--spec.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/spec.txt b/spec.txt
index 6d90d07..9f150dd 100644
--- a/spec.txt
+++ b/spec.txt
@@ -223,6 +223,9 @@ Line endings are replaced by newline characters (LF).
A line containing no characters, or a line containing only spaces (after
tab expansion), is called a [blank line](@blank-line).
+For security reasons, a conforming parser must strip or replace the
+Unicode character `U+0000`.
+
# Blocks and inlines
We can think of a document as a sequence of