diff --git a/app/views/homes/documentation.html.erb b/app/views/homes/documentation.html.erb
index 51f66f2c..f3e58291 100644
--- a/app/views/homes/documentation.html.erb
+++ b/app/views/homes/documentation.html.erb
@@ -142,7 +142,8 @@
       <p>After uploading a read, the app will automatically try to assign it to a contig and a primer. Multiple reads
         generated from the same isolate will automatically be assigned to the same contig.</p>
       <p>For this to work it is very important that all file names follow the pattern <em>&lt;isolate_identifier&gt;_&lt;primer_name&gt;.scf/ab1</em>!
-        It is also important that a record for the used primer was added to the app before uploading the read file. </p>
+        It is also important that a record for the used primer was added to the app before uploading the read file.
+        Isolate names may only contain letters, numbers or underscores. Primer names may only contain letters, numbers or hyphens.</p>
       <p>The app will attempt to trim the reads based on some preset parameters (the default settings are that in a window
         of 10 bases, at least 8 have to have a quality score above 30). You can change these parameters before attempting
         to trim the read again.
diff --git a/config/environments/test.rb b/config/environments/test.rb
index fe83d71d..79c4cb30 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -5,7 +5,7 @@
   # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped
   # and recreated between test runs. Don't rely on the data there!
-  config.cache_classes = true
+  config.cache_classes = false
 
   # Do not eager load code on boot. This avoids loading your whole application
   # just for the purpose of running a single test. If you are using a tool that
diff --git a/db/schema.rb b/db/schema.rb
index 9d2e9f71..88099b3e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -210,6 +210,7 @@
     t.text "locality"
     t.string "latitude_original", limit: 255
     t.string "longitude_original", limit: 255
+    t.string "elevation_orig", limit: 255
     t.string "exposition", limit: 255
     t.text "habitat"
     t.string "substrate", limit: 255
@@ -226,7 +227,6 @@
     t.integer "collection_id"
     t.integer "tissue_id"
     t.bigint "taxon_id"
-    t.string "elevation_orig"
     t.decimal "elevation"
     t.index ["collection_id"], name: "index_individuals_on_collection_id"
     t.index ["taxon_id"], name: "index_individuals_on_taxon_id"