diff --git a/.vim/after/syntax/prolog.vim b/.vim/after/syntax/prolog.vim
new file mode 100644
index 0000000..41a7f58
--- /dev/null
+++ b/.vim/after/syntax/prolog.vim
@@ -0,0 +1,3 @@
+syn keyword Operator \+ conceal cchar=¬
+syn keyword Operator ,  conceal cchar=∧
+syn keyword Operator ;  conceal cchar=∨