diff --git a/LICENSE.pdf b/LICENSE.pdf
index c62b584..15a521d 100644
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diff --git a/README.pdf b/README.pdf
index 5980d52..46dea79 100644
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diff --git a/find_stale_pdf.bash b/find_stale_pdf.bash
new file mode 100755
index 0000000..d770293
--- /dev/null
+++ b/find_stale_pdf.bash
@@ -0,0 +1,28 @@
+#!/bin/bash
+file_list=`find . -print | grep -i ".md"`
+
+for element in $file_list
+do
+	dir=`dirname ${element}`
+	cd $dir
+	md_name=`basename ${element} .md`
+    pdf_name=${md_name}.pdf
+    md_name=${md_name}.md
+    if [ ! -f $pdf_name ]
+    then
+        echo Generating missing PDF file in $dir for $md_name
+        pandoc $md_name -o $pdf_name
+        cd - > /dev/null
+        continue
+    fi
+    md_date=`date -r ${md_name} +%s`
+    pdf_date=`date -r ${pdf_name} +%s`
+    if [ $pdf_date -lt $md_date ];
+    then
+        #echo Is $pdf_date greater than $md_date 
+        echo Freshening $pdf_name in $dir
+        pandoc $md_name -o $pdf_name
+    fi 
+	cd - > /dev/null
+done
+
diff --git a/macros/README.pdf b/macros/README.pdf
index 63d58f6..e36a917 100644
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diff --git a/test.bash b/make_all_pdf.bash
similarity index 100%
rename from test.bash
rename to make_all_pdf.bash
diff --git a/section_1/hello_world/README.pdf b/section_1/hello_world/README.pdf
index f979946..b09d852 100644
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diff --git a/section_1/if/README.pdf b/section_1/if/README.pdf
index 731eb7b..3c3a3dd 100644
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diff --git a/section_1/recursion/README.pdf b/section_1/recursion/README.pdf
index dbe8388..42041e4 100644
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diff --git a/section_1/regs/README.pdf b/section_1/regs/README.pdf
index 9ac76f7..fc02c96 100644
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diff --git a/section_1/regs/backup.pdf b/section_1/regs/backup.pdf
index 80c8477..111235d 100644
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diff --git a/section_1/regs/ldr2.pdf b/section_1/regs/ldr2.pdf
index 5e70eaa..cd18b68 100644
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diff --git a/section_1/regs/regvar.pdf b/section_1/regs/regvar.pdf
index 8f67c4c..175def5 100644
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diff --git a/section_1/regs/spare.pdf b/section_1/regs/spare.pdf
index deeae64..94996ef 100644
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diff --git a/section_2/float/notes.pdf b/section_2/float/notes.pdf
new file mode 100644
index 0000000..acb8ff9
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