diff --git a/contents/drawings/977.tex b/contents/drawings/977.tex
index e3bdd38..fafff76 100644
--- a/contents/drawings/977.tex
+++ b/contents/drawings/977.tex
@@ -1,5 +1,6 @@
 % Author: Prof. Dr. Matthias Jung, DL9MJ
 % Year: 2024
+% Loop
 \begin{circuitikz}
     \ctikzset{
         RF/scale=\getDarcImageFactor,