diff --git a/README.md b/README.md
index 83f2e5d..bc1b0ee 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,13 @@ keyword.
 It will take a good look thru whole xlsx file and produce file with
 filtered data.
 
+# Usage
+
+Program takes two parameters:
+
+* ``-filename`` - path to file. Remember to quote it if it contains spaces!
+* ``-keyword`` - keyword to search for.
+
+Excelator will iterate thru all filled lines and cells and search for a
+keyword. If it found a match - it will write this line to file
+``filtered.xlsx`` which will be placed near binary (or in ``$PWD``).