diff --git a/docs/cmdline-opts/trace-ascii.d b/docs/cmdline-opts/trace-ascii.d
index 3d74b29038..2aebc28631 100644
--- a/docs/cmdline-opts/trace-ascii.d
+++ b/docs/cmdline-opts/trace-ascii.d
@@ -18,3 +18,7 @@ the output sent to stdout.
 This is similar to --trace, but leaves out the hex part and only shows the
 ASCII part of the dump. It makes smaller output that might be easier to read
 for untrained humans.
+
+Note that verbose output of curl activities and network traffic might contain
+sensitive data, including user names, credentials or secret data content. Be
+aware and be careful when sharing trace logs with others.
diff --git a/docs/cmdline-opts/trace.d b/docs/cmdline-opts/trace.d
index 97f4e2fdac..35b2248e90 100644
--- a/docs/cmdline-opts/trace.d
+++ b/docs/cmdline-opts/trace.d
@@ -15,3 +15,7 @@ Enables a full trace dump of all incoming and outgoing data, including
 descriptive information, to the given output file. Use "-" as filename to have
 the output sent to stdout. Use "%" as filename to have the output sent to
 stderr.
+
+Note that verbose output of curl activities and network traffic might contain
+sensitive data, including user names, credentials or secret data content. Be
+aware and be careful when sharing trace logs with others.
diff --git a/docs/cmdline-opts/verbose.d b/docs/cmdline-opts/verbose.d
index 4036aadc5e..c5661f86af 100644
--- a/docs/cmdline-opts/verbose.d
+++ b/docs/cmdline-opts/verbose.d
@@ -22,3 +22,7 @@ be more suitable options.
 
 If you think this option still does not give you enough details, consider using
 --trace or --trace-ascii instead.
+
+Note that verbose output of curl activities and network traffic might contain
+sensitive data, including user names, credentials or secret data content. Be
+aware and be careful when sharing trace logs with others.