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-rw-r--r--tools/libxc/xc.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/libxc/xc.h b/tools/libxc/xc.h
index 913581fe9d..3b464eb683 100644
--- a/tools/libxc/xc.h
+++ b/tools/libxc/xc.h
@@ -421,7 +421,7 @@ int xc_msr_write(int xc_handle, int cpu_mask, int msr, unsigned int low,
/**
* Memory maps a range within one domain to a local address range. Mappings
* should be unmapped with munmap and should follow the same rules as mmap
- * regarding page alignment.
+ * regarding page alignment. Returns NULL on failure.
*
* In Linux, the ring queue for the control channel is accessible by mapping
* the shared_info_frame (from xc_domain_getinfo()) + 2048. The structure