diff --git a/docs/symbol_files.md b/docs/symbol_files.md
index 89cc9d2d..e05b455b 100644
--- a/docs/symbol_files.md
+++ b/docs/symbol_files.md
@@ -33,8 +33,15 @@ restrictions, these may appear in any order.
 *   A `FILE` record gives a source file name, and assigns it a number by which
     other records can refer to it.
 
+*   An `INLINE_ORIGIN` record holds an inline function name for `INLINE` records
+    to refer to.
+
 *   A `FUNC` record describes a function present in the source code.
 
+*   An `INLINE` record describes the inline function's nest level, call site
+    line and call site source file to which the given ranges of machine code
+    should be attributed.
+
 *   A line record indicates to which source file and line a given range of
     machine code should be attributed. The line is attributed to the function
     defined by the most recent `FUNC` record.