diff --git a/semtiffconv.sh b/semtiffconv.sh
index 39fe12e..ac1e64f 100755
--- a/semtiffconv.sh
+++ b/semtiffconv.sh
@@ -4,6 +4,7 @@
 ## Taha Ahmed
 
 mogrify -format png *.tif
+# ${PWD##*/} extracts the name of the parent directory from the current path
 convert *.tif ${PWD##*/}.pdf
 
 exit 1