diff --git a/main.sh b/main.sh
index 6aa8bcb..5e675d3 100755
--- a/main.sh
+++ b/main.sh
@@ -374,6 +374,7 @@ info "__file: ${__file}"
 info "__dir: ${__dir}"
 info "__base: ${__base}"
 info "OSTYPE: ${OSTYPE}"
+info "Script called directly? $([[ "${__i_am_main_script}" = "1" ]] && echo "yes" || echo "no")"
 
 info "arg_f: ${arg_f}"
 info "arg_d: ${arg_d}"
diff --git a/test/fixture/main-debug.stdio b/test/fixture/main-debug.stdio
index ec65b64..7f40ee2 100644
--- a/test/fixture/main-debug.stdio
+++ b/test/fixture/main-debug.stdio
@@ -5,6 +5,7 @@ ACCPTST:STDIO_REPLACE_DATETIMES
 {datetime} UTC [     info] __dir: {root}
 {datetime} UTC [     info] __base: main
 {datetime} UTC [     info] OSTYPE: {OSTYPE}
+{datetime} UTC [     info] Script called directly? yes
 {datetime} UTC [     info] arg_f: {tmpdir}/x
 {datetime} UTC [     info] arg_d: 0
 {datetime} UTC [     info] arg_v: 0
diff --git a/test/fixture/main-nocolor.stdio b/test/fixture/main-nocolor.stdio
index 2cb3a6b..bbc459c 100644
--- a/test/fixture/main-nocolor.stdio
+++ b/test/fixture/main-nocolor.stdio
@@ -5,6 +5,7 @@ ACCPTST:STDIO_REPLACE_DATETIMES
 {datetime} UTC [     info] __dir: {root}
 {datetime} UTC [     info] __base: main
 {datetime} UTC [     info] OSTYPE: {OSTYPE}
+{datetime} UTC [     info] Script called directly? yes
 {datetime} UTC [     info] arg_f: {tmpdir}/x
 {datetime} UTC [     info] arg_d: 0
 {datetime} UTC [     info] arg_v: 0