diff --git a/Doc/lib/libcursespanel.tex b/Doc/lib/libcursespanel.tex
index 519091e..1f96717 100644
--- a/Doc/lib/libcursespanel.tex
+++ b/Doc/lib/libcursespanel.tex
@@ -22,6 +22,9 @@
 
 \begin{funcdesc}{new_panel}{win}
 Returns a panel object, associating it with the given window \var{win}.
+Be aware that you need to keep the returned panel object referenced
+explicitly.  If you don't, the panel object is garbage collected and
+removed from the panel stack.
 \end{funcdesc}
 
 \begin{funcdesc}{top_panel}{}