1 files changed, 7 insertions, 0 deletions
diff --git a/stap.1.in b/stap.1.in
index 7736a612..1a287a3e 100644
--- a/stap.1.in
+++ b/stap.1.in
@@ -183,6 +183,13 @@ Send standard output to named file. In bulk mode, percpu files will
 start with FILE_ (FILE_cpu with -F) followed by the cpu number.
 This supports strftime(3) formats for FILE.
 .TP
+.BI \-O[0123s]
+Optimization to use for C code. Passed to gcc in pass 4. -O is an
+alias for -O1, -O0 enables fast compilation, -O1 optimizes the code and
+takes a bit more time, -O2 optimizes more and takes more time, -O3
+optimizes even more and takes even more time, -Os optimizes for size,
+like -O2 but tuned for small code size. The default is -O0.
+.TP
 .BI \-c " CMD"
 Start the probes, run CMD, and exit when CMD finishes.
 .TP