1 files changed, 1 insertions, 0 deletions
diff --git a/src/HelpFile b/src/HelpFile
index 7edc19af7..a44470f0b 100644
--- a/src/HelpFile
+++ b/src/HelpFile
@@ -45,6 +45,7 @@ i,  import: i File
       -optimize     select an optimization to override file-defined flags
       -conversion   select parsing method (values strict|nondet)
       -probs        read probabilities from file (format (--# prob) Fun Double)
+      -preproc      use a preprocessor on each source file
       -noparse      read nonparsable functions from file (format --# noparse Funs) 
   examples:
       i English.gf                      -- ordinary import of Concrete