diff --git a/src/doc/trpl/inline-assembly.md b/src/doc/trpl/inline-assembly.md
index ab360de62f52..091eadcc9d82 100644
--- a/src/doc/trpl/inline-assembly.md
+++ b/src/doc/trpl/inline-assembly.md
@@ -77,7 +77,7 @@ asm!("xor %eax, %eax" ::: "{eax}");
 
 Input and output operands follow the same format: `:
 "constraints1"(expr1), "constraints2"(expr2), ..."`. Output operand
-expressions must be mutable lvalues:
+expressions must be mutable lvalues, or not yet assigned:
 
 ```
 # #![feature(asm)]