diff --git a/crystal/rna-transcription/src/rna_transcription.cr b/crystal/rna-transcription/src/rna_transcription.cr
index a875514..7f5e216 100644
--- a/crystal/rna-transcription/src/rna_transcription.cr
+++ b/crystal/rna-transcription/src/rna_transcription.cr
@@ -1 +1,5 @@
-# Please implement your solution to rna-transcription in this file
+class RnaComplement
+  def self.of(dna)
+  end
+end
+