diff --git a/download_all.sh b/download_all.sh
index aa5da14..339112f 100755
--- a/download_all.sh
+++ b/download_all.sh
@@ -1,16 +1,16 @@
 #!/bin/bash
 
 download_for_directory() {
-	cd $1
-	for f in *; do
-		if [ -d "$f" ]; then
-			download_for_directory $f &
-    	fi
-	done
-	ls | cat *.md 2> /dev/null | egrep -o 'https?://[^ ]+' | grep 'pdf' | tr -d ')' | xargs --no-run-if-empty wget --no-clobber --quiet --timeout=5 --tries=2
-
-	cd ..
-	echo "Done $1"
+    cd $1
+    for f in *; do
+        if [ -d "$f" ]; then
+            download_for_directory $f &
+        fi
+    done
+    ls | cat *.md 2> /dev/null | egrep -o 'https?://[^ ]+' | grep 'pdf' | tr -d ')' | xargs --no-run-if-empty wget --no-clobber --quiet --timeout=5 --tries=2
+    
+    cd ..
+    echo "Done $1"
 }
 
 download_for_directory .