Added man entry for --incremental-smt2-solver

Author: Enrico Steffinlongo

doc/man/cbmc.1

@@ -176,6 +176,11 @@ Output formula to given file
 Never turn arrays into uninterpreted functions
 .IP --arrays-uf-always
 Always turn arrays into uninterpreted functions
+.IP "--incremental-smt2-solver <cmd>"
+Use the incremental SMT backend where <cmd> is the command to invoke the SMT
+solver of choice using incremental mode and accepting input from the standard input.
+Note that the solver name must be in the "PATH" or be an executable with full
+path. Also the flag --slice-formula should be added to remove some not-yet supoorted features.
 .SH ENVIRONMENT
 All tools honor the TMPDIR environment variable when generating temporary
 files and directories. Furthermore note that