diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index d107366e18c270a8fba8a22dc5e6f4d3bcf3fe01..40868cd602869c8d975fa6d6a1877b528a1e7df4 100644
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -692,7 +692,7 @@ enum DAHDI_IFLIST {
 };
 
 struct dahdi_pvt {
-	ast_mutex_t lock;
+	ast_mutex_t lock;					/*!< Channel private lock. */
 	struct callerid_state *cs;
 	struct ast_channel *owner;			/*!< Our current active owner (if applicable) */
 							/*!< Up to three channels can be associated with this call */