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-rw-r--r--src/GF/Shell/HelpFile.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/GF/Shell/HelpFile.hs b/src/GF/Shell/HelpFile.hs
index e4a24cb9f..b3f8905fd 100644
--- a/src/GF/Shell/HelpFile.hs
+++ b/src/GF/Shell/HelpFile.hs
@@ -614,7 +614,9 @@ txtHelpFile =
"\n The default is share for concrete, none for resource modules." ++
"\n Each of the flags can have the suffix _subs, which performs" ++
"\n common subexpression elimination after the main optimization." ++
- "\n Thus, -optimize=all_subs is the most aggressive one." ++
+ "\n Thus, -optimize=all_subs is the most aggressive one. The _subs" ++
+ "\n strategy only works in GFC, and applies therefore in concrete but" ++
+ "\n not in resource modules." ++
"\n -optimize=share share common branches in tables" ++
"\n -optimize=parametrize first try parametrize then do share with the rest" ++
"\n -optimize=values represent tables as courses-of-values" ++