diff --git a/src/test.cpp b/src/test.cpp
index 5f0aa52..846cda2 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -175,7 +175,7 @@ bool whitespace(char x) {
 }
 
 // Straightforward recursive descent that doesn't handle string escaping and
-// treats numbers as [0-9]+
+// treats numbers as [0-9.]+. May stack overflow on deeply nested json documents
 struct Parser1 {
   Parser1(char *buf, int len, const Callbacks *callbacks, void *data)
       : buf(buf), len(len), callbacks(callbacks), data(data) {}
@@ -416,6 +416,8 @@ private:
 #define MUSTTAIL
 #endif
 
+// Table-based ll(1) parser that doesn't handle escaping and treats numbers as
+// [0-9.]+. Could be adapted to have a streaming interface. Uses O(1) memory.
 struct Parser2 {
   Parser2(char *buf, int len, const Callbacks *callbacks, void *data)
       : buf(buf), len(len), callbacks(callbacks), data(data) {}