diff --git a/README.md b/README.md
index 2ff0424..9cec251 100644
--- a/README.md
+++ b/README.md
@@ -75,8 +75,8 @@ tricu eval [OPTIONS]
 
   -f --file=FILE  Input file path(s) for evaluation.
                     Defaults to stdin.
-  -t --form=FORM  Optional output form: (fsl|tree|ast|ternary|ascii).
-                    Defaults to fsl "Fork Stem Leaf" form.
+  -t --form=FORM  Optional output form: (tree|fsl|ast|ternary|ascii).
+                    Defaults to tricu-compatible `t` tree form.
 
 tricu decode [OPTIONS]
   Decode a Tree Calculus value into a string representation.
diff --git a/src/Main.hs b/src/Main.hs
index 11eba15..4ef49ab 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -30,9 +30,9 @@ evaluateMode = Evaluate
   { file = def &= help "Input file path(s) for evaluation.\n \
       \ Defaults to stdin."
       &= name "f" &= typ "FILE"
-    , form = FSL &= typ "FORM"
-      &= help "Optional output form: (fsl|tree|ast|ternary|ascii).\n \
-      \ Defaults to fsl \"Fork Stem Leaf\" form."
+    , form = TreeCalculus &= typ "FORM"
+      &= help "Optional output form: (tree|fsl|ast|ternary|ascii).\n \
+      \ Defaults to tricu-compatible `t` tree form."
       &= name "t"
   }
   &= help "Evaluate tricu and return the result of the final expression."