diff --git a/src/main.c b/src/main.c
index babeceb..01c2eef 100644
--- a/src/main.c
+++ b/src/main.c
@@ -257,7 +257,7 @@ int main(int argc, const char *argv[]) {
 
 #ifndef SIST_SCAN_ONLY
             OPT_GROUP("Index options"),
-            OPT_STRING(0, "es-url", &common_es_url, "Elasticsearch url. DEFAULT=http://localhost:9200"),
+            OPT_STRING(0, "es-url", &common_es_url, "Elasticsearch url with port. DEFAULT=http://localhost:9200"),
             OPT_BOOLEAN('p', "print", &index_args->print, "Just print JSON documents to stdout."),
             OPT_STRING(0, "script-file", &index_args->script_path, "Path to user script."),
             OPT_INTEGER(0, "batch-size", &index_args->batch_size, "Index batch size. DEFAULT: 100"),