diff --git a/wobsite/.gitignore b/wobsite/.gitignore
index 2622867e88d960d96e90f2118c3b485df2ee7341..70355aacfc0edec357c54124801c4cfe64b377d6 100644
--- a/wobsite/.gitignore
+++ b/wobsite/.gitignore
@@ -113,4 +113,5 @@ crashlytics-build.properties
 .bundle
 vendor
 
-Gemfile.lock
\ No newline at end of file
+Gemfile.lock
+PASSWORD
\ No newline at end of file
diff --git a/wobsite/_config.yml b/wobsite/_config.yml
index 29af91756de2f991d3ec363c2b8ab5f97010ce1c..0b287b914ab70ee3e1278a2e60474ff82e60da96 100644
--- a/wobsite/_config.yml
+++ b/wobsite/_config.yml
@@ -53,4 +53,5 @@ exclude:
     - Makefile
     - README.md
     - LICENSE
-    - deploy
\ No newline at end of file
+    - deploy
+    - PASSWORD
\ No newline at end of file
diff --git a/wobsite/controls.md b/wobsite/controls.md
index fb84b1dbdf17c8a760810922bafdec5039cea506..d630bbff780df769d255e49602dba95ecdae3784 100644
--- a/wobsite/controls.md
+++ b/wobsite/controls.md
@@ -20,6 +20,6 @@ The model we are developing follows the methods developed by our advising
 graduate student Matt Rich in his thesis [Model development, system
 identification, and control of a quadrotor helicopter][1].
 
-
+<img src="images/pid_diagram.png" width="700">
 
 [1]: http://lib.dr.iastate.edu/etd/12770/
\ No newline at end of file
diff --git a/wobsite/deploy b/wobsite/deploy
index e47333bbd7e14bbdd1486591aaa5ee56f0d2e62e..a15fa0e47389c94b383c42fb3f8d582e5ae5e850 100644
--- a/wobsite/deploy
+++ b/wobsite/deploy
@@ -2,7 +2,11 @@
 
 HOST=may1716.sd.ece.iastate.edu
 USERNAME=may1716
-PASSWORD=6peprikt
+[ -e PASSWORD ] || echo "ERROR: File PASSWORD is missing.
+Create a file called PASSWORD, and put the sftp password in that file.
+No spaces. No newlines."
+[ -e PASSWORD ] || exit 1
+PASSWORD=$(cat PASSWORD)
 
 cd _site || exit 1
 
@@ -13,3 +17,5 @@ cd www
 mirror -R
 exit
 END_SCRIPT
+
+echo "Website updated."
\ No newline at end of file
diff --git a/wobsite/images/pid_diagram.png b/wobsite/images/pid_diagram.png
new file mode 100644
index 0000000000000000000000000000000000000000..bfe5ce5a2ee538c8a5fd24c0e8562d6e43d5e883
Binary files /dev/null and b/wobsite/images/pid_diagram.png differ