Cleanup TRUE/FALSE vs true/false
diff --git a/src/hb-buffer.h b/src/hb-buffer.h
index ca1bbf4..fe53197 100644
--- a/src/hb-buffer.h
+++ b/src/hb-buffer.h
@@ -121,13 +121,13 @@
 void
 hb_buffer_reset (hb_buffer_t *buffer);
 
-/* Returns FALSE if allocation failed */
+/* Returns false if allocation failed */
 hb_bool_t
 hb_buffer_pre_allocate (hb_buffer_t  *buffer,
 		        unsigned int  size);
 
 
-/* Returns FALSE if allocation has failed before */
+/* Returns false if allocation has failed before */
 hb_bool_t
 hb_buffer_allocation_successful (hb_buffer_t  *buffer);