diff --git a/camlibs/panasonic/coolshot/README b/camlibs/panasonic/coolshot/README
index 33fbd8a3c..9bb2fc765 100644
--- a/camlibs/panasonic/coolshot/README
+++ b/camlibs/panasonic/coolshot/README
@@ -16,4 +16,8 @@ TODO List
 - file upload capability
 - better error checking ("fixme"s) & recovery
 - modify coolshot_file_count to return GP_ code and take *count as argument
+	Comment by Lutz <urc8@rz.uni-karlsruhe.de>: Why? Throughout libgphoto2,
+	we say that negative return values are errors. That is, we do
+	CHECK_RESULT (pic_num = count_pictures (camera)); everywhere and let
+	CHECK_RESULT test for a return value < 0.