diff --git a/docs/sophia_stdlib.md b/docs/sophia_stdlib.md
index 776ee0f..74b27f9 100644
--- a/docs/sophia_stdlib.md
+++ b/docs/sophia_stdlib.md
@@ -457,10 +457,10 @@ Oracle.get_answer(o : oracle('a, 'b), q : oracle_query('a, 'b)) : option('b)
 Checks what is the optional query answer
 
 
-#### expire
+#### expiry
 
 ```
-Oracle.expire(o : oracle('a, 'b)) : int
+Oracle.expiry(o : oracle('a, 'b)) : int
 ```
 
 Ask the oracle when it expires. The result is the block height at which it will happen.