diff --git a/lab01/histogram.cpp b/lab01/histogram.cpp
index 2fcff5d..71dc381 100644
--- a/lab01/histogram.cpp
+++ b/lab01/histogram.cpp
@@ -3,7 +3,7 @@
 #include <iostream>
 using namespace std;
 
-static void
+void
 find_minmax(const vector<double>& numbers, double& min, double& max) {
     min = numbers[0];
     max = numbers[0];
diff --git a/lab01/histogram_internal.h b/lab01/histogram_internal.h
new file mode 100644
index 0000000..e69de29