diff --git a/API-Reference.md b/API-Reference.md
index 2e53337..d126489 100644
--- a/API-Reference.md
+++ b/API-Reference.md
@@ -431,29 +431,36 @@ Sets the value at specified index.
 ##### Signatures
 
 ```c++
-void set(size_t index, bool value);
-void set(size_t index, float value, uint8_t decimals = 2);
-void set(size_t index, double value, uint8_t decimals = 2);
-void set(size_t index, signed char value);
-void set(size_t index, signed long value);
-void set(size_t index, signed int value);
-void set(size_t index, signed short value);
-void set(size_t index, unsigned char value);
-void set(size_t index, unsigned long value);
-void set(size_t index, unsigned int value);
-void set(size_t index, unsigned short value);
-void set(size_t index, const char *value);
-void set(size_t index, const String &value); // see Remarks
-void set(size_t index, JsonArray &array);
-void set(size_t index, JsonObject &object);
-void set(size_t index, const JsonVariant &value);
+bool set(size_t index, bool value);
+bool set(size_t index, float value, uint8_t decimals = 2);
+bool set(size_t index, double value, uint8_t decimals = 2);
+bool set(size_t index, signed char value);
+bool set(size_t index, signed long value);
+bool set(size_t index, signed int value);
+bool set(size_t index, signed short value);
+bool set(size_t index, unsigned char value);
+bool set(size_t index, unsigned long value);
+bool set(size_t index, unsigned int value);
+bool set(size_t index, unsigned short value);
+bool set(size_t index, const char *value);
+bool set(size_t index, const String &value); // see Remarks
+bool set(size_t index, JsonArray &array);
+bool set(size_t index, JsonObject &object);
+bool set(size_t index, const JsonVariant &value);
 ```
 
 ##### Arguments
 
 `index`: position to set value in array.
+
 `value`: the value to set in index of array.
 
+##### Return value
+
+`true` if allocation succeeded.
+
+`false` if there was not enough space left in the `JsonBuffer`, this can only happen when `value` is a `String`.
+
 ##### Remarks
 
 When you call `JsonArray::set(size_t, const String&)`, a copy of the string is made, causing the `JsonBuffer` to grow.
@@ -1149,7 +1156,7 @@ will print the following string to the serial output:
 ```
 
 
-### JsonArray::set()
+### JsonObject::set()
 
 ##### Description
 
@@ -1158,45 +1165,52 @@ Sets the value at specified key.
 ##### Signatures
 
 ```c++
-void set(const char* key, bool value);
-void set(const char* key, float value, uint8_t decimals = 2);
-void set(const char* key, double value, uint8_t decimals = 2);
-void set(const char* key, signed char value);
-void set(const char* key, signed long value);
-void set(const char* key, signed int value);
-void set(const char* key, signed short value);
-void set(const char* key, unsigned char value);
-void set(const char* key, unsigned long value);
-void set(const char* key, unsigned int value);
-void set(const char* key, unsigned short value);
-void set(const char* key, const char *value);
-void set(const char* key, const String &value);                  // see Remarks
-void set(const char* key, JsonArray &array);
-void set(const char* key, JsonObject &object);
-void set(const char* key, const JsonVariant &value);
-void set(const String& key, bool value);                         // see Remarks
-void set(const String& key, float value, uint8_t decimals = 2);  // see Remarks
-void set(const String& key, double value, uint8_t decimals = 2); // see Remarks
-void set(const String& key, signed char value);                  // see Remarks
-void set(const String& key, signed long value);                  // see Remarks
-void set(const String& key, signed int value);                   // see Remarks
-void set(const String& key, signed short value);                 // see Remarks
-void set(const String& key, unsigned char value);                // see Remarks
-void set(const String& key, unsigned long value);                // see Remarks
-void set(const String& key, unsigned int value);                 // see Remarks
-void set(const String& key, unsigned short value);               // see Remarks
-void set(const String& key, const char *value);                  // see Remarks
-void set(const String& key, const String &value);                // see Remarks twice
-void set(const String& key, JsonArray &array);                   // see Remarks
-void set(const String& key, JsonObject &object);                 // see Remarks
-void set(const String& key, const JsonVariant &value);           // see Remarks
+bool set(const char* key, bool value);
+bool set(const char* key, float value, uint8_t decimals = 2);
+bool set(const char* key, double value, uint8_t decimals = 2);
+bool set(const char* key, signed char value);
+bool set(const char* key, signed long value);
+bool set(const char* key, signed int value);
+bool set(const char* key, signed short value);
+bool set(const char* key, unsigned char value);
+bool set(const char* key, unsigned long value);
+bool set(const char* key, unsigned int value);
+bool set(const char* key, unsigned short value);
+bool set(const char* key, const char *value);
+bool set(const char* key, const String &value);                  // see Remarks
+bool set(const char* key, JsonArray &array);
+bool set(const char* key, JsonObject &object);
+bool set(const char* key, const JsonVariant &value);
+bool set(const String& key, bool value);                         // see Remarks
+bool set(const String& key, float value, uint8_t decimals = 2);  // see Remarks
+bool set(const String& key, double value, uint8_t decimals = 2); // see Remarks
+bool set(const String& key, signed char value);                  // see Remarks
+bool set(const String& key, signed long value);                  // see Remarks
+bool set(const String& key, signed int value);                   // see Remarks
+bool set(const String& key, signed short value);                 // see Remarks
+bool set(const String& key, unsigned char value);                // see Remarks
+bool set(const String& key, unsigned long value);                // see Remarks
+bool set(const String& key, unsigned int value);                 // see Remarks
+bool set(const String& key, unsigned short value);               // see Remarks
+bool set(const String& key, const char *value);                  // see Remarks
+bool set(const String& key, const String &value);                // see Remarks twice
+bool set(const String& key, JsonArray &array);                   // see Remarks
+bool set(const String& key, JsonObject &object);                 // see Remarks
+bool set(const String& key, const JsonVariant &value);           // see Remarks
 ```
 
 ##### Arguments
 
 `key`: the key to attach the value to.
+
 `value`: the value to attach to the key.
 
+##### Return value
+
+`true` if allocation succeeded.
+
+`false` if there was not enough space left in the `JsonBuffer`.
+
 ##### Remarks
 
 When you use a `String`, a copy of the string is made, causing the `JsonBuffer` to grow.