diff --git a/Definition.md b/Definition.md
index 5829592..71c16e7 100644
--- a/Definition.md
+++ b/Definition.md
@@ -2,7 +2,7 @@
 
 Operators and functions that add, remove or modify definitions. Other utilities for modifying environments may be included.
 
-- set
+## set
 
 builtin: (set _symbol_ _value_)
 
@@ -33,7 +33,7 @@ be modified in the following example:
 This returns 5, and `myvar` will evaluate to 5 afterwards.
 Using set for a symbol that doesn't have a binding in the current environment is an error.
 
-- setq
+## setq
 
 macro: (setq _symbol_ _value_)
 
@@ -41,7 +41,7 @@ Same as set, except setq automatically quotes its first parameter.
 
 `(setq x 5)` is equivalent to `(set 'x 5)`.
 
-- def
+## def
 
 builtin: (def _sym_ _val_)