diff --git a/ChangeLog b/ChangeLog
index 6fab500b9..b07de515d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-12-27  Werner Lemberg  <wl@gnu.org>
+
+	* src/truetype/ttgload.c (tt_loader_init): Add more tracing.
+
 2012-12-23  Werner Lemberg  <wl@gnu.org>
 
 	[type1] Fix handling of /FontBBox in MM fonts.
diff --git a/src/truetype/ttgload.c b/src/truetype/ttgload.c
index 374f89dce..55eb71dae 100644
--- a/src/truetype/ttgload.c
+++ b/src/truetype/ttgload.c
@@ -2000,6 +2000,9 @@
         FT_UInt  i;
 
 
+        FT_TRACE4(( "tt_loader_init: subpixel hinting change,"
+                    " re-executing `prep' table\n" ));
+
         exec->subpixel_hinting = subpixel_hinting;
 
         for ( i = 0; i < size->cvt_size; i++ )
@@ -2014,6 +2017,9 @@
         FT_UInt  i;
 
 
+        FT_TRACE4(( "tt_loader_init: grayscale hinting change,"
+                    " re-executing `prep' table\n" ));
+
         exec->grayscale_hinting = grayscale_hinting;
 
         for ( i = 0; i < size->cvt_size; i++ )