diff --git a/include/common/buf.h b/include/common/buf.h
index 857b6c48..24158630 100644
--- a/include/common/buf.h
+++ b/include/common/buf.h
@@ -71,9 +71,9 @@ void buf_add(struct buf *s, const char *data);
 /**
  * buf_add_char - add single char to C string buffer
  * @s: buffer
- * @data: char to be added
+ * @ch: char to be added
  */
-void buf_add_char(struct buf *s, char data);
+void buf_add_char(struct buf *s, char ch);
 
 /**
  * buf_clear - clear the buffer, internal allocations are preserved