X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fadd_context.c;h=b1f81e6b3176d19a49957847727bed1afb723ac4;hp=405b7828f043dea695beff3bde4206cec59ee4ff;hb=c455d428591ca798da9f1e7c2aeb7db348d74853;hpb=59b41aa2b4d4f74cefb898c9a45e82194ee7ff15

diff --git a/src/bin/lttng/commands/add_context.c b/src/bin/lttng/commands/add_context.c
index 405b7828f..b1f81e6b3 100644
--- a/src/bin/lttng/commands/add_context.c
+++ b/src/bin/lttng/commands/add_context.c
@@ -514,6 +514,9 @@ 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 per-cpu\n"
 			"perf counters (hardware branch misses and cache misses), to all channels\n"