diff --git a/README.md b/README.md
index 850e5ea..63c350e 100644
--- a/README.md
+++ b/README.md
@@ -205,7 +205,7 @@ Calling a function is done with the `INVOCA` keyword.
 
 ## Built-ins
 ### DICE
-`DICE value ...`
+`DICE(value, ...)`
 
 Prints one or more values to stdout, space-separated, with integers rendered as Roman numerals. Returns the printed string.
 
@@ -232,7 +232,7 @@ Skips the rest of the current loop body and continues to the next iteration (`DV
 Breaks out of the current loop (`DVM` or `PER`). Has no meaningful return value.
 
 ### LONGITVDO
-`LONGITVDO array` or `LONGITVDO string`
+`LONGITVDO(array)` or `LONGITVDO(string)`
 
 Returns the length of `array` (element count) or `string` (character count) as an integer.