diff --git a/ext/json/ext/generator/generator.c b/ext/json/ext/generator/generator.c
index 0b7397c56..d686375ea 100644
--- a/ext/json/ext/generator/generator.c
+++ b/ext/json/ext/generator/generator.c
@@ -1542,7 +1542,7 @@ static VALUE cState_array_nl_set(VALUE self, VALUE array_nl)
 /*
  * call-seq: as_json()
  *
- * This string is put at the end of a line that holds a JSON array.
+ * Returns the callback used to convert unsupported objects in strict mode.
  */
 static VALUE cState_as_json(VALUE self)
 {
@@ -1553,7 +1553,7 @@ static VALUE cState_as_json(VALUE self)
 /*
  * call-seq: as_json=(as_json)
  *
- * This string is put at the end of a line that holds a JSON array.
+ * Sets the Proc used to convert unsupported objects in strict mode.
  */
 static VALUE cState_as_json_set(VALUE self, VALUE as_json)
 {
@@ -1800,8 +1800,7 @@ static VALUE cState_depth(VALUE self)
 /*
  * call-seq: depth=(depth)
  *
- * This sets the maximum level of data structure nesting in the generated JSON
- * to the integer depth, max_nesting = 0 if no maximum should be checked.
+ * Sets the current depth of data structure nesting to the integer +depth+.
  */
 static VALUE cState_depth_set(VALUE self, VALUE depth)
 {
diff --git a/lib/json/common.rb b/lib/json/common.rb
index 3b5e3157a..5ceb8a2ee 100644
--- a/lib/json/common.rb
+++ b/lib/json/common.rb
@@ -224,7 +224,7 @@ def detailed_message(...)
   Fragment = Struct.new(:json) do
     def initialize(json)
       unless string = String.try_convert(json)
-        raise TypeError, " no implicit conversion of #{json.class} into String"
+        raise TypeError, "no implicit conversion of #{json.class} into String"
       end
 
       super(string)