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-rw-r--r--isar/isar-syntax.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/isar/isar-syntax.el b/isar/isar-syntax.el
index e3b2a4bd..81e052bd 100644
--- a/isar/isar-syntax.el
+++ b/isar/isar-syntax.el
@@ -294,7 +294,7 @@
"^proof (state):"
"^goal (theorem .*):"
"^prems:"
- "^using this:"
+ "^\\(using \\)?this:"
"^goal (show):"
"^Variables:$"
"^Constants:$"