diff --git a/admin/ChangeLog b/admin/ChangeLog
index 7671ae409cd..63ed9bfbd6c 100644
--- a/admin/ChangeLog
+++ b/admin/ChangeLog
@@ -3,6 +3,8 @@
 	* unidata/unidata-gen.el (unidata-split-name): Don't give any NAME
 	to <control> characters: the Unicode Standard says they have no
 	name.  (Bug#16216)
+	(unidata-describe-bidi-class): Add new "isolate" classes
+	introduced by Unicode 6.3.
 
 2013-12-12  David Engster  <deng@randomsample.de>
 
diff --git a/admin/unidata/unidata-gen.el b/admin/unidata/unidata-gen.el
index ed531eeea25..b0f69468de1 100644
--- a/admin/unidata/unidata-gen.el
+++ b/admin/unidata/unidata-gen.el
@@ -1134,6 +1134,10 @@ is the character itself.")))
 	       (RLE . "Right-to-Left Embedding")
 	       (RLO . "Right-to-Left Override")
 	       (PDF . "Pop Directional Format")
+	       (LRI . "Left-to-Right Isolate")
+	       (RLI . "Right-to-Left Isolate")
+	       (FSI . "First Strong Isolate")
+	       (PDI . "Pop Directional Isolate")
 	       (EN . "European Number")
 	       (ES . "European Number Separator")
 	       (ET . "European Number Terminator")