diff --git a/include/memory.h b/include/memory.h
index d5e2606..9f1c80f 100644
--- a/include/memory.h
+++ b/include/memory.h
@@ -5,6 +5,8 @@ void *why2_malloc(unsigned long size);
 void *why2_calloc(unsigned long element, unsigned long size);
 void *why2_realloc(void *pointer, unsigned long size);
 
+char *why2_strdup(char *string);
+
 void why2_free(void *pointer);
 
 #endif
\ No newline at end of file