diff --git a/teckids.sty b/teckids.sty
index efd84ce8e65e016f1f139138a0cbb15d59373964..0f4d6c6c170a7ba6a35ff10a12d7ea3a30ca7fc9 100644
--- a/teckids.sty
+++ b/teckids.sty
@@ -200,7 +200,10 @@
  \textbf{Aufgabe für #1, zur Erledigung bis #2}: #3
 }
 
-% From: http://tex.stackexchange.com/a/159701/43807
+% From https://tex.stackexchange.com/a/159701/43807 (but trivial)
+% © 2014 Fran <https://tex.stackexchange.com/users/11604/fran>
+% Question by Charles Staats
+% <https://tex.stackexchange.com/users/484/charles-staats>
 
 \usepackage[table]{xcolor}
 \usepackage{newunicodechar}