diff --git a/src/hash.cr b/src/hash.cr
index cfa556f921ed..e14b92ee482e 100644
--- a/src/hash.cr
+++ b/src/hash.cr
@@ -2149,6 +2149,7 @@ class Hash(K, V)
     hash
   end
 
+  # :nodoc:
   struct Entry(K, V)
     getter key, value, hash