diff --git a/KEYWORDS.md b/KEYWORDS.md
index 15432e9f4..a29865e89 100644
--- a/KEYWORDS.md
+++ b/KEYWORDS.md
@@ -9,26 +9,31 @@ The keywords and their values define what rules the data should satisfy to be va
 ## Keywords
 
 - [type](#type)
-- [maximum/minimum and exclusiveMaximum/exclusiveMinimum](#maximum--minimum-and-exclusivemaximum--exclusiveminimum)
-- [multipleOf](#multipleof)
-- [maxLength/minLength](#maxlength--minlength)
-- [pattern](#pattern)
-- [format](#format)
-- [maxItems/minItems](#maxitems--minitems)
-- [uniqueItems](#uniqueitems)
-- [items](#items)
-- [additionalItems](#additionalitems)
-- [maxProperties/minProperties](#maxproperties--minproperties)
-- [required](#required)
-- [properties](#properties)
-- [patternProperties](#patternproperties)
-- [additionalProperties](#additionalproperties)
-- [dependencies](#dependencies)
-- [enum](#enum)
-- [not](#not)
-- [oneOf](#oneof)
-- [anyOf](#anyof)
-- [allOf](#allof)
+- [Keywords for numbers](#keywords-for-numbers)
+    - [maximum/minimum and exclusiveMaximum/exclusiveMinimum](#maximum--minimum-and-exclusivemaximum--exclusiveminimum)
+    - [multipleOf](#multipleof)
+- [Keywords for strings](#keywords-for-strings)
+    - [maxLength/minLength](#maxlength--minlength)
+    - [pattern](#pattern)
+    - [format](#format)
+- [Keywords for arrays](#keywords-for-arrays)
+    - [maxItems/minItems](#maxitems--minitems)
+    - [uniqueItems](#uniqueitems)
+    - [items](#items)
+    - [additionalItems](#additionalitems)
+- [Keywords for objects](#keywords-for-objects)
+    - [maxProperties/minProperties](#maxproperties--minproperties)
+    - [required](#required)
+    - [properties](#properties)
+    - [patternProperties](#patternproperties)
+    - [additionalProperties](#additionalproperties)
+    - [dependencies](#dependencies)
+- [Keywords for all types](#keywords-for-all-types)
+    - [enum](#enum)
+    - [not](#not)
+    - [oneOf](#oneof)
+    - [anyOf](#anyof)
+    - [allOf](#allof)
 
 
 
diff --git a/README.md b/README.md
index 19e3ec47c..12a7a8a8e 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,8 @@ ajv compiles schemas to functions and caches them in all cases (using stringifie
 
 The best performance is achieved when using compiled functions returned by `compile` or `getSchema` methods (there is no additional function call).
 
+__Please note__: every time validation function or `ajv.validate` are called `errors` property is overwritten. You need to copy `errors` array reference to another variable if you want to use it later (e.g., in the callback).
+
 
 ## Using in browser
 
@@ -191,6 +193,8 @@ Instead of the schema you can use the key that was previously passed to `addSche
 
 Validation errors will be available in the `errors` property of ajv instance (`null` if there were no errors).
 
+__Please note__: every time this method is called the errors are overwritten so you need to copy them to another variable if you want to use them later.
+
 
 ##### .addSchema(Array<Object>|Object schema [, String key])