diff --git a/container/FIFOBase.h b/container/FIFOBase.h
index b744706d..edd66d37 100644
--- a/container/FIFOBase.h
+++ b/container/FIFOBase.h
@@ -19,32 +19,46 @@ public:
 	/**
 	 * Insert value into FIFO
 	 * @param value
-	 * @return
+	 * @return RETURN_OK on success, FULL if full
 	 */
 	ReturnValue_t insert(T value);
 	/**
 	 * Retrieve item from FIFO. This removes the item from the FIFO.
-	 * @param value
-	 * @return
+	 * @param value Must point to a valid T
+	 * @return RETURN_OK on success, EMPTY if empty and FAILED if nullptr check failed
 	 */
 	ReturnValue_t retrieve(T *value);
 	/**
 	 * Retrieve item from FIFO without removing it from FIFO.
-	 * @param value
-	 * @return
+	 * @param value Must point to a valid T
+	 * @return RETURN_OK on success, EMPTY if empty and FAILED if nullptr check failed
 	 */
 	ReturnValue_t peek(T * value);
 	/**
 	 * Remove item from FIFO.
-	 * @return
+	 * @return RETURN_OK on success, EMPTY if empty
 	 */
 	ReturnValue_t pop();
 
+	/***
+	 * Check if FIFO is empty
+	 * @return True if empty, False if not
+	 */
 	bool empty();
+	/***
+	 * Check if FIFO is Full
+	 * @return True if full, False if not
+	 */
 	bool full();
+	/***
+	 *  Current used size (elements) used
+	 * @return size_t in elements
+	 */
 	size_t size();
-
-
+	/***
+	 * Get maximal capacity of fifo
+	 * @return size_t with max capacity of this fifo
+	 */
 	size_t getMaxCapacity() const;
 
 protected:
diff --git a/container/FIFOBase.tpp b/container/FIFOBase.tpp
index d54b3f8f..763004b6 100644
--- a/container/FIFOBase.tpp
+++ b/container/FIFOBase.tpp
@@ -26,6 +26,9 @@ inline ReturnValue_t FIFOBase<T>::retrieve(T* value) {
 	if (empty()) {
 		return EMPTY;
 	} else {
+		if (value == nullptr){
+			return HasReturnvaluesIF::RETURN_FAILED;
+		}
 		*value = values[readIndex];
 		readIndex = next(readIndex);
 		--currentSize;
@@ -38,6 +41,9 @@ inline ReturnValue_t FIFOBase<T>::peek(T* value) {
 	if(empty()) {
 		return EMPTY;
 	} else {
+		if (value == nullptr){
+			return HasReturnvaluesIF::RETURN_FAILED;
+		}
 		*value = values[readIndex];
 		return HasReturnvaluesIF::RETURN_OK;
 	}