diff --git a/src/main.cpp b/src/main.cpp
index fa8bb67..d9c2a46 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,7 +11,8 @@
 using namespace std;
 
 void print_help() {
-    cout << "usage: gitlabvers [-h|--version]\n";
+    cout << "usage: gitlabvers [-a|-h|--version]\n";
+    cout << "  -a, --all     show all versions from changelog\n";
     cout << "  -h, --help    show this help text and exit\n";
     cout << "  --version     show version number and exit\n";
 }