diff --git a/src/HeightMap.cpp b/src/HeightMap.cpp
index b3d374b..537c1bf 100644
--- a/src/HeightMap.cpp
+++ b/src/HeightMap.cpp
@@ -132,7 +132,7 @@ void HeightMap::statistics()
 };
 
 
-void HeightMap::calculate_steepness()
+void HeightMap::calculate_steepness(const char* filepath)
 {
     int kernel_height = 5;
     int kernel_width = 5;
@@ -176,12 +176,11 @@ void HeightMap::calculate_steepness()
     }
     }
     GDALAllRegister();
-    GDALDataset *original_file = (GDALDataset *) GDALOpen( filepath, GA_ReadOnly );
+    GDALDataset *original_file = (GDALDataset *) GDALOpen( this->filepath, GA_ReadOnly );
 
-    const char * filename = "steepness.tif";
     auto driver = GetGDALDriverManager()->GetDriverByName("GeoRaster");
     GDALDataset *file;
-    file = driver->CreateCopy("steepness.tif", original_file, FALSE, NULL, NULL, NULL);
+    file = driver->CreateCopy(filepath, original_file, FALSE, NULL, NULL, NULL);
 
     file->AddBand(GDT_Float32, NULL);
     GDALRasterBand *band = file->GetRasterBand(0);
diff --git a/src/contour_creator.hh b/src/contour_creator.hh
index c697b6e..59c3b63 100644
--- a/src/contour_creator.hh
+++ b/src/contour_creator.hh
@@ -26,7 +26,7 @@ class HeightMap
         float get_pixel(int x,int y);
         void blur(float standard_deviation);
         void statistics();
-        void calculate_steepness();
+        void calculate_steepness(const char*);
 };
 
 /**
diff --git a/src/main.cpp b/src/main.cpp
index 2185237..2a195d7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -295,13 +295,16 @@ int main(int argc, const char* argv[])
     if (cmdl[{ "-h", "--help" }])
     {
         std::cout << "Usage:\n"
-            << "contour_creator [OPTIONS] <input_file>\n"
+            << "contour_creator [OPTIONS] <input_file>\n\n"
+            << "Arguments in the form --<name>=<value>:"
             << "-o; --output <FILENAME.geojson> - File to write output to (Default: contours.geojson)\n"
             << "-i; --interval <int> - Set the interval between contours (Default: 5)\n"
             << "-b; --blur - Blur the image\n"
-            << "--stats - Print statistical information about the heightmap\n";
+            << "--stats - Print statistical information about the heightmap\n"
+            << "--steepness <filename> - Create steepness map\n";
             exit(0);
     }
+
     int interval;
     cmdl({"-i", "--interval"}, 5) >> interval;
     if (interval <= 0)
@@ -320,6 +323,10 @@ int main(int argc, const char* argv[])
     if (cmdl[{"--stats"}])
         map.statistics();
 
+    std::string steepness_output_file;
+    if (cmdl({"--steepness"}, "steepness.tif") >> steepness_output_file)
+        map.calculate_steepness(output_file.c_str());
+
     auto lines = create_lines(&map, interval);
     write_output_file(lines, output_file.c_str(), &map);
     std::cout << "Contours written to " << output_file << " 🗺️\n";