show-generation: Add help text

1 files changed, 9 insertions, 0 deletions

diff --git a/nix-script-show-generation.sh b/nix-script-show-generation.sh
index 5924846..27320ad 100755
--- a/nix-script-show-generation.sh
+++ b/nix-script-show-generation.sh
@@ -10,6 +10,15 @@ usage() {
         -u       Show user generation (default)
         -h       Show this help and exit
 
+    Show the number of the current generations. Defaults to user
+    profile, but system profile can be checked as well.
+
+    Example usage:
+
+        # To show the system generation which is current.
+        # With verbosity on.
+        nix-script -v show-generations -s
+
 $(help_end)
 EOS
 }