diff --git a/libpri.h b/libpri.h
index f9986c5..afbb029 100644
--- a/libpri.h
+++ b/libpri.h
@@ -194,8 +194,8 @@
 #define PRI_REVERSECHARGE_NONE      -1
 #define PRI_REVERSECHARGE_REQUESTED  1
 
-/* Causes for disconnection */
-#define PRI_CAUSE_UNALLOCATED					1
+/* Causes for disconnection (See Q.850) */
+#define PRI_CAUSE_UNALLOCATED					1	/*!< Called number unassigned. */
 #define PRI_CAUSE_NO_ROUTE_TRANSIT_NET			2	/* !Q.SIG */
 #define PRI_CAUSE_NO_ROUTE_DESTINATION			3
 #define PRI_CAUSE_CHANNEL_UNACCEPTABLE			6
diff --git a/pri.c b/pri.c
index 97aa72b..a48841f 100644
--- a/pri.c
+++ b/pri.c
@@ -54,7 +54,7 @@ struct pri_timer_table {
 
 /*!
  * \note Sort the timer table entries in the order of the timer name so
- * pri_dump_info_str() can display them in a consitent order.
+ * pri_dump_info_str() can display them in a consistent order.
  */
 static const struct pri_timer_table pri_timer[] = {
 /* *INDENT-OFF* */