Typo fix

theano/gof/opt.py

@@ -1125,7 +1125,7 @@ class EquilibriumOptimizer(NavigatorOptimizer):
         if max_use_abort:
             _logger.error("EquilibriumOptimizer max'ed out by '%s'" % opt_name
                           + ". You can safely raise the current threshold of "
-                          + "%f with the theano flasg 'optdb.max_use_ratio'." %
+                          + "%f with the theano flag 'optdb.max_use_ratio'." %
                           config.optdb.max_use_ratio)
 
     def print_summary(self, stream=sys.stdout, level=0, depth=-1):