diff --git a/drivers/thunderbolt/cap.c b/drivers/thunderbolt/cap.c
index 6f571e912cf2..8ecd610c62d5 100644
--- a/drivers/thunderbolt/cap.c
+++ b/drivers/thunderbolt/cap.c
@@ -178,7 +178,7 @@ int tb_switch_next_cap(struct tb_switch *sw, unsigned int offset)
 
 /**
  * tb_switch_find_cap() - Find switch capability
- * @sw Switch to find the capability for
+ * @sw: Switch to find the capability for
  * @cap: Capability to look
  *
  * Returns offset to start of capability or %-ENOENT if no such