Fix up ustack documentation

The ustack documentation was missing the stack mode argument. It was also referencing nothing.
bpftrace · May 24, 2019 · 5eeeb10 · 5eeeb10
1 parent 32daaa2
commit 5eeeb10
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/docs/reference_guide.md b/docs/reference_guide.md
@@ -1830,9 +1830,9 @@ Attaching 1 probe...
 
 ## 16. `ustack()`: Stack Traces, User
 
-Syntax: `ustack([int level])`
+Syntax: `ustack([StackMode mode, ][int limit])`
 
-This builtin is an alias to `ustack()` (see).
+These are implemented using BPF stack maps.
 
 Examples: