diff --git a/docs/LangRef.html b/docs/LangRef.html
index 35585f252b8..3af8b68a228 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -519,9 +519,26 @@ the future:
This calling convention (the default if no other calling convention is
specified) matches the target C calling conventions. This calling convention
supports varargs function calls and tolerates some mismatch in the declared
- prototype and implemented declaration of the function (as does normal C).
+ prototype and implemented declaration of the function (as does normal C). For
+ integer arguments less than 32-bits, the value will be sign-extended to
+ 32-bits before the call is made. If zero-extension is required, use the
+ cextcc calling convention.
+ "cextcc(bitmask)" - The C with explicit extend calling
+ convention :
+ This calling convention is exactly like the C calling convention except
+ that it is parameterized to provide a bitmask that indicates how
+ integer arguments of less than 32-bits should be extended. A zero bit
+ indicates zero-extension while a 1-bit indicates sign-extension. The least
+ significant bit always corresponds to the return type of the function. The
+ bits in the bitmask are assigned to the integer parameters of the
+ function that are smaller than 32-bits. For example, a bitmask of value
+ 5 (0b0101) indicates that the return value is to be sign extended, the first
+ small integer argument is to be zero extended and the second small integer
+ argument is to be sign extended.
+
+
"csretcc" - The C struct return calling convention:
This calling convention matches the target C calling conventions, except
@@ -535,6 +552,14 @@ the future:
pointer to a struct as the first argument.
+ "csretextcc(bitmask)" - The C struct return with explicit
+ extend calling convention:
+ This calling convention is exactly like the csret calling
+ convention except that it is parameterized to provide a bitmask
+ that indicates how integer arguments of less than 32-bits should be extended.
+ A zero bit indicates zero-extension while a 1-bit indicates sign-extension.
+
+
"fastcc" - The fast calling convention:
This calling convention attempts to make calls as fast as possible