diff --git a/blah.cr b/blah.cr
index 07d5c0b..2f742e6 100644
--- a/blah.cr
+++ b/blah.cr
@@ -23,7 +23,7 @@ db.each do |car|
 end
 
 # Reaching all objects in the db with their key.
-db.each_with_index do |car,key|
+db.each_with_key do |car,key|
 	pp! car, key
 end
 
diff --git a/graphs/graphs.ms b/graphs/graphs.ms
index b025502..2e13098 100644
--- a/graphs/graphs.ms
+++ b/graphs/graphs.ms
@@ -247,12 +247,12 @@ database.delete 0
 .QE
 .
 The function
-.FUNCTION_CALL each_with_index
+.FUNCTION_CALL each_with_key
 lists the entries with their keys.
 .
 .QP
 .SOURCE Ruby ps=10
-database.each_with_index do |value, key|
+database.each_with_key do |value, key|
 	puts "#{key}: #{value}"
 end
 .SOURCE
@@ -586,7 +586,7 @@ end
 .QP
 .SOURCE Ruby ps=10
 # List all the values in the database with their key
-database.each_with_index do |value, key|
+database.each_with_key do |value, key|
 	# ...
 end
 .SOURCE