diff --git a/src/hash.cr b/src/hash.cr
index 8d48e1cd8c08..96b87c7d3e22 100644
--- a/src/hash.cr
+++ b/src/hash.cr
@@ -2148,6 +2148,7 @@ class Hash(K, V)
     hash
   end
 
+  # :nodoc:
   struct Entry(K, V)
     getter key, value, hash