Add note about <eval> tag for errors in xml.md

1 files changed, 1 insertions, 0 deletions

diff --git a/xml.md b/xml.md
index 9d3b83f826..0556fb2415 100644
--- a/xml.md
+++ b/xml.md
@@ -462,6 +462,7 @@ ev
 - eval()uates some code
 - output wrapped in <eval> tags
 - output is here first a dump of xml tags (see "Variable Dump" section), then a dump wrapped in <stream> tags
+- if there's an error, the tag will be <eval>, instead of the usual <php> tag
 
 sh
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