diff --git a/docs/sources/logql/template_functions.md b/docs/sources/logql/template_functions.md
index 9ed5784b52ff..877359d9dfb4 100644
--- a/docs/sources/logql/template_functions.md
+++ b/docs/sources/logql/template_functions.md
@@ -220,7 +220,7 @@ Get a substring from a string.
 
 Signature:
 
-`trunc(start int,end int,value string) string`
+`substr(start int,end int,value string) string`
 
 If start is < 0, this calls value[:end].
 If start is >= 0 and end < 0 or end bigger than s length, this calls value[start:]