diff --git a/README.md b/README.md
index c81d771..055dd25 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Usage:
 This macro returns the starting position of the first occurrence of a string in another string. The search is not case-sensitive. If the string is not found, the function returns 0. This macro can be used to check whether a string contains another string.
 
 Usage: 
-`{{ pm_utils.charindex('[expression_to_find]', '[expression_to_search]', '[start_location]') }}`
+`{{ pm_utils.charindex('[expression_to_find]', '[field]', '[start_location]') }}`
 
 #### create_index ([source](macros/multiple_databases/create_index.sql))
 This macro creates a clustered columnstore index on the current model for SQL Server. This macro should be used in a dbt post-hook.