diff --git a/.gitignore b/.gitignore
index d4cb09e..9051e1c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 lib/.precomp/*
 .precomp/*
 t/tmp/
+
+workspace.xml
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..a55e7a1
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..1a52d03
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="Perl 6 v2019.03.1" project-jdk-type="Perl 6 SDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..b2dda38
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/pod-cached.iml" filepath="$PROJECT_DIR$/pod-cached.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..67bc904
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,5 @@
+# Things to do
+
+* [ ] File should probably be a distinct object. Right now it's a key and a config, and lots of things are done on it, but it's not clear how to add a new file, for instance. It would be much easier if cached files could be created, compiled and handled in an independent way; that way, it would be easier to add secondary files to the cache.
+
+* [ ] Once file handling is done, it would be easier to add (or eliminate) files from the cache.
diff --git a/lib/Pod/To/Cached.pm6 b/lib/Pod/To/Cached.pm6
index 1ba96d6..951e3e7 100644
--- a/lib/Pod/To/Cached.pm6
+++ b/lib/Pod/To/Cached.pm6
@@ -5,6 +5,8 @@ use nqp;
 use JSON::Fast;
 use CompUnit::PrecompilationRepository::Document;
 
+constant @extensions = <pod pod6>;
+
 =begin pod
 
 =TITLE Pod::To::Cached
@@ -54,7 +56,7 @@ $cache.freeze;
     path to the collection of pod files
     ignored if cache frozen
 
-=item @!extensions = <pod pod6>
+=item constant @extensions = <pod pod6>
     the possible extensions for a POD file
 
 =item verbose = False
@@ -102,7 +104,7 @@ $cache.freeze;
 =item pod
     method pod(Str $source)
     Returns an array of POD Objects generated from the file associated with $source name.
-    When a doc-set is being actively updated, then pod files may have failed, in which case they have Status Valid.
+    When a doc-set is being actively updated, then pod files may have failed, in which case they have C<Status> = C<Valid>.
     To froze a cache, all files must have Current status
 
 =item Status is an enum with the following elements and semantics
@@ -124,7 +126,6 @@ enum Status is export <Current Valid Failed New Old>; # New is internally used,
 
 has Str $.path = '.pod6-cache';
 has Str $.source = 'doc';
-has @.extensions = <pod pod6>;
 has Bool $.verbose is rw;
 has $.precomp;
 has %.files;
@@ -333,7 +334,7 @@ method get-pods {
     #| Recursively finds all pod files
      @!pods = my sub recurse ($dir) {
          gather for dir($dir) {
-             take .Str if  .extension ~~ any( @!extensions );
+             take .Str if  .extension ~~ any( @extensions );
              take slip sort recurse $_ if .d;
          }
      }($!source); # is the first definition of $dir
diff --git a/pod-cached.iml b/pod-cached.iml
new file mode 100644
index 0000000..8b2e557
--- /dev/null
+++ b/pod-cached.iml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PERL6_MODULE_TYPE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/t" isTestSource="true" />
+    </content>
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file