diff --git a/core/models/survex.py b/core/models/survex.py
index 75d14f7..d5be489 100644
--- a/core/models/survex.py
+++ b/core/models/survex.py
@@ -222,7 +222,7 @@ class SurvexBlock(models.Model):
     name = models.CharField(max_length=100)
     title = models.CharField(max_length=200)
     parent = models.ForeignKey("SurvexBlock", blank=True, null=True, on_delete=models.SET_NULL, db_index=True)
-    ref_text = models.CharField(max_length=200, blank=True, null=True)
+    ref_text = models.CharField(max_length=400, blank=True, null=True)
 
     date = models.DateField(blank=True, null=True)
     expedition = models.ForeignKey("Expedition", blank=True, null=True, on_delete=models.SET_NULL, db_index=True)