diff --git a/README.md b/README.md
new file mode 100644
index 0000000..56a5d70
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# sliding-puzzle
+A simple game which takes an image, then slices it into tiles and shuffles. You need to restore the initial image by swapping neighbor tiles! It's a command line application and does support --help.
+
+### How to build
+You only need a compiler supporting c++17 and sfml 2.5.1 (or latter versions).
+
+### Usage
+usage: sliding-puzzle [-OPTIONS...] FILE-OR-DIRECTORY
+
+    Provide FILE-OR-DIRECTORY variable as a path to either a directory
+    which contains images (one will be picked randomly) or a specific
+    image file of .bmp, .jpg, of .png format.
+
+    If no path was provided, it will be assumed as '.'!
+
+    Options:
+      [-r NUMxNUM] Provide it if you want to explicitly define
+                   window resolution.
+      [-s NUM]     Provide it if you want to explicitly define
+                   qualifier for image slicing, it's counted
+                   by the smallest side of given source texture.
+                   Hence, if your image is square, the amount of tiles
+                   will be num * num.
diff --git a/output_util.h b/output_util.h
index 8f1ce98..7e7adb6 100644
--- a/output_util.h
+++ b/output_util.h
@@ -8,15 +8,18 @@ namespace output
 
     const char* NO_ARG_MSG = "Please at least provide a path to a target image. --help for more information.\n";
     const char* HELP_MSG = "usage: sliding-puzzle [-OPTIONS...] FILE-OR-DIRECTORY\n\n"
-                       "    Necessarily provide the latter variable as path to either a directory\n"
-                       "    which contains arts (one will be picked randomly) or a specific\n"
-                       "    image file of .bmp, .dds, .jpg, .png, .tga, or .psd format.\n\n"
+                       "    Provide FILE-OR-DIRECTORY variable as a path to either a directory\n"
+                       "    which contains images (one will be picked randomly) or a specific\n"
+                       "    image file of .bmp, .jpg, of .png format.\n\n"
+                       "    If no path was provided, it will be assumed as \'.\'!\n\n"
                        "    Options:\n"
-                       "      [-s num]  Provide it if you want to explicitly define\n"
-                       "                qualifier for image slicing, it's counted\n"
-                       "                by the smallest side of given source texture.\n"
-                       "                Hence, if your image is square, the amount of tiles\n"
-                       "                will be num * num.\n";
+                       "      [-r NUMxNUM] Provide it if you want to explicitly define\n"
+                       "                   window resolution.\n"
+                       "      [-s NUM]     Provide it if you want to explicitly define\n"
+                       "                   qualifier for image slicing, it's counted\n"
+                       "                   by the smallest side of given source texture.\n"
+                       "                   Hence, if your image is square, the amount of tiles\n"
+                       "                   will be num * num.\n";
     const char* SPLITTING_MSG = "-s should be given with a positive num >= 2 as in [-s num].\n";
     const char* IMG_FAIL_MSG  = "Couldn't load image from given path.\n";
     const char* RESOLUTION_MSG = "Couldn't recognize given screen resolution.\n"