diff --git a/checkpw.c b/checkpw.c
index 08aed08..36b9164 100644
--- a/checkpw.c
+++ b/checkpw.c
@@ -1,10 +1,12 @@
 /*
- * checkpw is a program to check the validity of a user password on a
+ * checkpw is a program to check the validity of a users password on a
  * Linux/PAM-based system.
  *
  * Usage: checkpw -u $USER -p $PASSWORD
  *
  * Returns 0 on success, 1 otherwise.
+ *
+ * License: MIT (see LICENSE)
  */
 
 #include <security/pam_appl.h>
diff --git a/checkpw_interactive.c b/checkpw_interactive.c
index ea5eee1..b42155b 100644
--- a/checkpw_interactive.c
+++ b/checkpw_interactive.c
@@ -1,3 +1,14 @@
+/*
+ * checkpw is a program to check the validity of a users password on a
+ * Linux/PAM-based system.
+ *
+ * Usage: checkpw
+ *
+ * Returns 0 on success, 1 otherwise.
+ *
+ * License: MIT (see LICENSE)
+ */
+
 #include <security/pam_appl.h>
 #include <security/pam_misc.h>
 #include <stdio.h>