X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fadd_context.c;h=d034d0b86d1e13f94b5a58c2cc7911a54b48e78c;hb=83a1318f7bff257225fc5603352db648c0055134;hp=390b53827572ec802cf5e57f3bbd6f72b1909693;hpb=e75c3b320b6414a28b274e2e755904ea6b45f35a;p=lttng-tools.git

diff --git a/src/bin/lttng/commands/add_context.c b/src/bin/lttng/commands/add_context.c
index 390b53827..d034d0b86 100644
--- a/src/bin/lttng/commands/add_context.c
+++ b/src/bin/lttng/commands/add_context.c
@@ -322,6 +322,9 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "                           TYPE can be one of the strings below:\n");
 	print_ctx_type(ofp);
 	fprintf(ofp, "\n");
+	fprintf(ofp, "Note that the vpid, vppid and vtid context types represent the virtual process id,\n"
+			"virtual parent process id and virtual thread id as seen from the current execution context\n"
+			"as opposed to the pid, ppid and tid which are kernel internal data structures.\n\n");
 	fprintf(ofp, "Example:\n");
 	fprintf(ofp, "This command will add the context information 'prio' and two perf\n"
 			"counters (hardware branch misses and cache misses), to all channels\n"