diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 366f599..67bd47d 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -62,7 +62,7 @@ SPCD_BANNER_UP_AND_LEFT="╯"
 SPCD_BANNER_UP_AND_RIGHT="╰"
 SPCD_BANNER_VERTICAL="│"
 
-spcd_banner_add() {
+_spcd_banner_add() {
     if [ -n "${1}" ]; then
         spcd_ba__text=" ${1} "
         spcd_ba__length=${#spcd_ba__text}
@@ -92,7 +92,7 @@ spcd_banner_add_index() {
             spcd_bai__label="${spcd_bai__value}"
         fi
     done
-    spcd_banner_add "${spcd_bai__label}"
+    _spcd_banner_add "${spcd_bai__label}"
 }
 
 spcd_banner_append() {
@@ -126,7 +126,7 @@ spcd_banner_open() {
 
 spcd_banner_render() {
     spcd_banner_unset
-    spcd_banner_add "S"
+    _spcd_banner_add "S"
     spcd_banner_add_index
     #
     unset spcd_br__level
@@ -134,7 +134,7 @@ spcd_banner_render() {
         spcd_br__level=$((spcd_br__level + 1))
         eval "spcd_br__value=\"\${SPCD_STEP_${spcd_br__level}_LABEL}\""
         [ -n "${spcd_br__value}" ] || break
-        spcd_banner_add "${spcd_br__value}"
+        _spcd_banner_add "${spcd_br__value}"
     done
     #
     spcd_banner_close