diff --git a/README.md b/README.md
index ed9a54e..eb719df 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,8 @@ It is inspired by:
 ## How it works
 
 You go to a directory.
-You run the command bin:
- * All files in this directory are inspected, new files are added to the database.
+You run the command bir:
+ * All files in this directory are inspected, new files are added to the database, deleted files are removed from the database.
  * If the file last modification date in database and on the disk is the same, but the content checksum is different, then a bit rot is detected.
 
 ## How to setup your environment on Linux
@@ -19,3 +19,15 @@ You run the command bin:
 Example:
 
     alias bir='java -jar /rv/data/desktop/code/code.nanoboot.org/nanoboot/bit-inspector/target/bir-inspector-0.0.0-SNAPSHOT-jar-with-dependencies.jar'
+
+## Usage
+
+"Bit Inspector" creates an SQLite database - file ".bir.sqlite3" in the current directory.
+
+There is also created the  file ".bir.sqlite3.sha512", which contains the current hash sum of file ".bir.sqlite3".
+
+You can create file .birignore containing the names of the files/directories you wish to ignore
+* each line should contain exactly one name
+* lines starting with # are skipped
+* you may use Unix shell-style wildcards
+