diff --git a/src/parser_yin.h b/src/parser_yin.h
index bda7f92..7bf278a 100644
--- a/src/parser_yin.h
+++ b/src/parser_yin.h
@@ -26,7 +26,25 @@
 #define yin_attr2str(STMT) yin_attr_list[STMT]
 
 #define YIN_NS_URI "urn:ietf:params:xml:ns:yang:yin:1"
+
+/**
+ * @brief Get start of full name including possible prefix.
+ *
+ * @param[in] name Start of name in input data.
+ * @param[in] prefix_len Lenght of prefix.
+ *
+ * @return Pointer to begining of full element name including prefix.
+ */
 #define name2fname(name, prefix_len) (prefix_len != 0 ? name - (prefix_len + 1) : name)
+
+/**
+ * @brief Get length of full name including possible prefix.
+ *
+ * @param[in] name_len Lenght of name without prefix.
+ * @param[in] prefix_len Lenght of prefix.
+ *
+ * @return Lenght of full name including possible prefix and ':' delimiter.
+ */
 #define len2flen(name_len, prefix_len) (prefix_len != 0 ? name_len + prefix_len + 1 : name_len)
 
 #define VALID_VALS1 " Only valid value is \"%s\"."
diff --git a/tests/src/test_parser_yin.c b/tests/src/test_parser_yin.c
index 482d9b2..5ddba08 100644
--- a/tests/src/test_parser_yin.c
+++ b/tests/src/test_parser_yin.c
@@ -66,7 +66,7 @@
 int store = -1; /* negative for infinite logging, positive for limited logging */
 
 /* set to 0 to printing error messages to stderr instead of checking them in code */
-#define ENABLE_LOGGER_CHECKING 0
+#define ENABLE_LOGGER_CHECKING 1
 
 #if ENABLE_LOGGER_CHECKING
 static void