diff --git a/checkDocumentationUpdated.sh b/checkDocumentationUpdated.sh
new file mode 100755
index 0000000..e9ac6fd
--- /dev/null
+++ b/checkDocumentationUpdated.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Check if the documentation in the man directory matches what should be in it
+# based on what is in the headers of the R scripts.
+echo "Starting documentation check."
+
+# Concatenate all the files in the man dir into one long string and md5sum it.
+orig_sum=$(find man -type f | sort -u | xargs cat | md5sum)
+
+# Rebuild the documentation.
+R -e "devtools::document()"
+
+# Concatenate all the files in the man dir into one long string and md5sum it.
+new_sum=$(find man -type f | sort -u | xargs cat | md5sum)
+
+# echo $orig_sum
+# echo $new_sum
+
+if [ "$orig_sum" != "$new_sum" ]; then
+  echo "Your committed manual files (man/*.Rd) are out of sync with the documentation in the R files."
+  echo "Run roxygenise() locally then commit again."
+  exit 1
+else
+  echo "Documentation up to date."
+  exit 0
+fi