Index: docs/LangRef.rst
===================================================================
--- docs/LangRef.rst
+++ docs/LangRef.rst
@@ -2343,12 +2343,14 @@
 ``nnan``
    No NaNs - Allow optimizations to assume the arguments and result are not
    NaN. Such optimizations are required to retain defined behavior over
-   NaNs, but the value of the result is undefined.
+   NaNs, but the value of the result is unspecified. The unspecified result
+   may not be the same each time the instruction is executed.
 
 ``ninf``
    No Infs - Allow optimizations to assume the arguments and result are not
    +/-Inf. Such optimizations are required to retain defined behavior over
-   +/-Inf, but the value of the result is undefined.
+   +/-Inf, but the value of the result is unspecified. The unspecified result
+   may not be the same each time the instruction is executed.
 
 ``nsz``
    No Signed Zeros - Allow optimizations to treat the sign of a zero