diff --git a/resources/function_help/json/$x_at b/resources/function_help/json/$x_at
index 1bbf1a93656..23cc00b4ed2 100644
--- a/resources/function_help/json/$x_at
+++ b/resources/function_help/json/$x_at
@@ -2,7 +2,7 @@
   "name": "$x_at",
   "type": "function",
   "description": "Retrieves a x coordinate of the current feature's geometry.",
-  "arguments": [ {"arg":"i","description":"index of point of a line (indices start at 0; negative values apply from the last index)"}],
+  "arguments": [ {"arg":"i","description":"index of point of a line (indices start at 0; negative values apply from the last index, starting at -1)"}],
   "examples": [ { "expression":"$x_at(1)", "returns":"5"}
   ]
 }
diff --git a/resources/function_help/json/$y_at b/resources/function_help/json/$y_at
index 1129ca797bb..5354b8759b1 100644
--- a/resources/function_help/json/$y_at
+++ b/resources/function_help/json/$y_at
@@ -2,7 +2,7 @@
   "name": "$y_at",
   "type": "function",
   "description": "Retrieves a y coordinate of the current feature's geometry.",
-  "arguments": [ {"arg":"i","description":"index of point of a line (indices start at 0; negative values apply from the last index)"}],
+  "arguments": [ {"arg":"i","description":"index of point of a line (indices start at 0; negative values apply from the last index, starting at -1)"}],
   "examples": [ { "expression":"$y_at(1)", "returns":"2"}
   ]
 }