diff --git a/src/cw/cw_rand.c b/src/cw/cw_rand.c
index f91974c6..044da35d 100644
--- a/src/cw/cw_rand.c
+++ b/src/cw/cw_rand.c
@@ -22,12 +22,13 @@
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
+#include <time.h>
 
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 
-#include "cw_util.h"
+#include "rand.h"
 #include "log.h"
 
 char *cw_rand_dev = "/dev/random";
@@ -57,7 +58,12 @@ int cw_rand_r(uint8_t * dst, int len)
 }
 
 
-
+/**
+ * Generate random bytes
+ * @param dst Destination where to store random bytes
+ * @param len Number of bytes to generate
+ * @return Number of generated bytes
+ */
 int cw_rand(uint8_t * dst, int len)
 {
 	static uint32_t rinit = 0;