diff --git a/src/common.h b/src/common.h
index d502dc4..0114888 100644
--- a/src/common.h
+++ b/src/common.h
@@ -1,3 +1,8 @@
+/**
+ * @file
+ * Common include headers
+ */
+
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -14,18 +19,13 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
+/** @defgroup MemoryMgmt Memory management macro
+ * @{*/
+/** frees memory and sets pointer to zero */
 #define FREE(ptr) \
   free((ptr)); (ptr) = NULL;
 
+/** allocates memory, and checks is it really allocated */
 #define CALLOC(ptr, nmemb, size) \
   assert(((ptr) = calloc((nmemb), (size))) != NULL);
-
-#define STRNDUP(ptr, str, len) \
-  assert(((ptr) = strndup((str), (len))) != NULL);
-
-/*
-extern int image_add(uint64_t, char *path);
-extern int image_del(uint64_t);
-extern int image_exists(uint64_t);
-extern int image_search(uint64_t, simdb_rec_t **data, size_t limit);
-*/
+/** @} */