diff --git a/README.md b/README.md
index 6d1ebf5..e34ccfa 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,10 @@ you want a different value than the default 1024 bytes).
 API documentation can be found here:
 http://godoc.org/github.com/mutecomm/go-sqlcipher
 
+Use the function
+[sqlite3.IsEncrypted()](https://godoc.org/github.com/mutecomm/go-sqlcipher#IsEncrypted)
+to check whether a database file is encrypted or not.
+
 Examples can be found under the `./_example` directory
 
 
diff --git a/sqlcipher.go b/sqlcipher.go
index 03c632c..c0e5e5f 100644
--- a/sqlcipher.go
+++ b/sqlcipher.go
@@ -9,8 +9,9 @@ import (
 // sqlite3Header defines the header string used by SQLite 3.
 var sqlite3Header = []byte("SQLite format 3\000")
 
-// IsEncrypted returns true, if the file with filename is encrypted, false
-// otherwise. If the file cannot be read properly an error is returned.
+// IsEncrypted returns true, if the database with the given filename is
+// encrypted, and false otherwise.
+// If the database header cannot be read properly an error is returned.
 func IsEncrypted(filename string) (bool, error) {
 	// open file
 	db, err := os.Open(filename)