diff --git a/.phpci.yml b/.phpci.yml
index 24ddfe69..b4fd52ec 100644
--- a/.phpci.yml
+++ b/.phpci.yml
@@ -8,6 +8,7 @@ build_settings:
     - "PHPCI/Migrations" # Ignore the migrations directory, as both PHPMD and PHPCS can't cope with them.
     - "PHPCI/Model/Base" # These files are auto-generated, and sometimes hit PHPMD complexity thresholds.
     - "PHPCI/Languages" # PHPCS fails on character counts for non-Latin languages
+    - "public/assets" # If there are any PHP files in here, we didn't write them.
 
 setup:
   composer:
diff --git a/PHPCI/Model/Build.php b/PHPCI/Model/Build.php
index b083ad1b..aab96635 100644
--- a/PHPCI/Model/Build.php
+++ b/PHPCI/Model/Build.php
@@ -276,6 +276,10 @@ class Build extends BuildBase
         exec(sprintf(IS_WIN ? 'rmdir /S /Q "%s"' : 'rm -Rf "%s"', $buildPath));
     }
 
+    /**
+     * Get the number of seconds a build has been running for.
+     * @return int
+     */
     public function getDuration()
     {
         $start = $this->getStarted();
diff --git a/PHPCI/Model/BuildError.php b/PHPCI/Model/BuildError.php
index 3e5edf4a..8d005e26 100644
--- a/PHPCI/Model/BuildError.php
+++ b/PHPCI/Model/BuildError.php
@@ -19,6 +19,10 @@ class BuildError extends BuildErrorBase
     const SEVERITY_NORMAL = 2;
     const SEVERITY_LOW = 3;
 
+    /**
+     * Get the language string key for this error's severity level.
+     * @return string
+     */
     public function getSeverityString()
     {
         switch ($this->getSeverity()) {
@@ -36,6 +40,10 @@ class BuildError extends BuildErrorBase
         }
     }
 
+    /**
+     * Get the class to apply to HTML elements representing this error.
+     * @return string
+     */
     public function getSeverityClass()
     {
         switch ($this->getSeverity()) {
diff --git a/PHPCI/Store/BuildErrorStore.php b/PHPCI/Store/BuildErrorStore.php
index 33918a39..9ba92310 100644
--- a/PHPCI/Store/BuildErrorStore.php
+++ b/PHPCI/Store/BuildErrorStore.php
@@ -16,6 +16,12 @@ use PHPCI\Store\Base\BuildErrorStoreBase;
  */
 class BuildErrorStore extends BuildErrorStoreBase
 {
+    /**
+     * Get a list of errors for a given build, since a given time.
+     * @param $buildId
+     * @param string $since date string
+     * @return array
+     */
     public function getErrorsForBuild($buildId, $since = null)
     {
         $query = 'SELECT * FROM build_error
diff --git a/PHPCI/Store/BuildMetaStore.php b/PHPCI/Store/BuildMetaStore.php
index 1fc0567d..15424f82 100644
--- a/PHPCI/Store/BuildMetaStore.php
+++ b/PHPCI/Store/BuildMetaStore.php
@@ -19,6 +19,12 @@ use PHPCI\Model\BuildMeta;
  */
 class BuildMetaStore extends BuildMetaStoreBase
 {
+    /**
+     * Only used by an upgrade migration to move errors from build_meta to build_error
+     * @param $start
+     * @param $limit
+     * @return array
+     */
     public function getErrorsForUpgrade($start, $limit)
     {
         $query = 'SELECT * FROM build_meta