diff -r a474900d5bd2 -r 255c853ea2f0 src/Tools/isac/Interpret/appl.sml
--- a/src/Tools/isac/Interpret/appl.sml	Thu Dec 22 11:12:18 2016 +0100
+++ b/src/Tools/isac/Interpret/appl.sml	Thu Dec 22 11:36:20 2016 +0100
@@ -216,7 +216,7 @@
 
 
 
-(*.applicability of a tacic wrt. a calc-state (ptree,pos').
+(*.applicability of a tacic wrt. a calc-state (ctree,pos').
    additionally used by next_tac in the script-interpreter for script-tacs.
    tests for applicability are so expensive, that results (rewrites!)
    are kept in the return-value of 'type tac_'.