diff --git a/source/ircd/versions.d b/source/ircd/versions.d
new file mode 100644
index 0000000..a22569c
--- /dev/null
+++ b/source/ircd/versions.d
@@ -0,0 +1,29 @@
+module ircd.versions;
+
+/++
+    Supported versions:
+
+    * NotStrict: enabled when any versions are enabled that disable RFC-strictness (i.e. any of the following)
+    * SupportTLS: compile with TLS support, enabled when NotStrict is on
+    * BasicFixes: enable basic/sanity RFC fixes
+    * MaxNickLengthConfigurable: makes max nick length configurable
+    * Modern: enable all versions
++/
+
+version (SupportTLS) version = NotStrict;
+version (BasicFixes) version = NotStrict;
+version (MaxNickLengthConfigurable) version = NotStrict;
+
+version (NotStrict)
+{
+    version = SupportTLS;
+}
+
+version (Modern)
+{
+    version = NotStrict;
+
+    version = SupportTLS;
+    version = BasicFixes;
+    version = MaxNickLengthConfigurable;
+}